J/ApJ/791/88ivo://CDS.VizieR/J/ApJ/791/88doi:10.26093/cds/vizier.17910088CDSFiliz Ak N.Brandt W.N.Hall P.B.Schneider D.P.Trump J.R.,Anderson S.F.Hamann F.Myers A.D.Paris I.Petitjean P.Ross N.P.,Shen Y.York D.2017-07-19T07:50:48Z2017-04-07T15:37:07ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frquasarsspectroscopyline-intensitiesWe consider how the profile and multi-year variability properties of a large sample of C IV Broad Absorption Line (BAL) troughs change when BALs from Si IV and/or Al III are present at corresponding velocities, indicating that the line of sight intercepts at least some lower ionization gas. We derive a number of observational results for C IV BALs separated according to the presence or absence of accompanying lower ionization transitions, including measurements of composite profile shapes, equivalent width (EW), characteristic velocities, composite variation profiles, and EW variability. We also measure the correlations between EW and fractional-EW variability for C IV, Si IV, and Al III. Our measurements reveal the basic correlated changes between ionization level, kinematics, and column density expected in accretion-disk wind models; e.g., lines of sight including lower ionization material generally show deeper and broader C IV troughs that have smaller minimum velocities and that are less variable. Many C IV BALs with no accompanying Si IV or Al III BALs may have only mild or no saturation.2014ApJ...791...88Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/791/88CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/449/1593 : CIV absorption in BAL QSOs (Baskin+, 2015)J/MNRAS/454/3962 : 188 CIV BAL QSOs from SDSS DR7 (He+, 2015)J/ApJ/824/130 : SDSS/BOSS/TDSS CIV BAL quasars (Grier+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/791/88https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/791/88http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/791/88https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/791/88https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/791/88http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/791/88GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/791/88/table1 (Main- BAL Quasars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/791/88/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/791/88/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/791/88/table1?GETtext/xml+votable180.050000true0.3318415.8080.0055555555555555566/2 552 4099 4105 4124 4128 4139 4167 4175 4178 4192 4196 4210 4231 4240 4242 4361 4665 4727 4743 4758 4803 4810 4813 4826 4831 4833 4843 4859 4874 4889 4893 4895 4910 4921 4932 4943 4947 4953 4958 4959 4963 4966 4975 4982 4984 4985 4991 5012 5028 5055 5062 5070 5082 5084 5090 5099 5101 5102 5105 5112 5222 5230 5239 5246 5271 5277 5287 5301 5306 5327 5332 5335 5336 5338 5352 5354 5361 5372 5395 5396 5397 5437 5444 5448 5449 5458 5463 5464 5510 5515 5517 5518 5519 5527 5530 5539 5544 5569 5598 5611 5613 5615 5627 5630 5641 5648 5652 5654 5660 5672 5676 5681 5683 5684 5686 5698 5701 5707 5712 5714 5715 5721 5723 5731 5761 5766 5772 5777 5779 5785 5795 5807 5809 5822 5863 5867 5870 5878 5879 5891 5897 5912 5915 5955 5973 5974 5977 6022 6038 6041 6048 6221 6223 6237 6240 6247 6267 6337 6384 6388 6414 6435 6455 6458 6477 6479 6481 6485 6491 6496 6498 6502 6503 6506 6513 6517 6526 6559 6568 6583 6599 6606 6607 6618 6620 6630 6640 6648 7173 7186 7190 7194 7199 7225 7230 7233 7261 7275 7318 7328 7424 7460 7480 8192 8228 8231 8321 8374 8375 8376 8719 8831 9054 9143 9161 9176 9181 9182 9197 9201 9211 9232 9234 9239 9241 9256 9257 9281 9290 9308 9312 9324 9331 9335 9350 9355 9359 9374 9379 9380 9382 9387 9391 9396 9399 9403 9406 9416 9439 9504 9514 9518 9606 9632 9636 9733 9738 9753 9769 9773 9789 9791 9797 9802 9806 9842 9849 9851 9901 9909 9914 9918 9931 9948 9989 9995 10295 10337 10367 10385 10393 10425 10440 10492 10502 10510 10519 10521 10531 10544 10551 10571 10582 10586 10587 10588 10594 10611 10629 10635 10641 10649 10658 10667 10675 10677 10679 10685 10687 10698 10706 10713 10715 10717 10720 10723 10729 10730 10760 10762 10795 10812 10827 10848 10853 10865 10882 10887 10913 10931 10938 10947 10950 10953 10966 10969 10983 10987 10988 10998 11003 11005 11013 11017 11023 11027 11034 11036 11057 11084 11086 11110 11113 11116 11127 11147 11148 11163 11194 11221 11240 11241 11260 11266 11268 11272 11276 11290 11308 11318 11320 11325 11327 11337 11345 11349 11359 11369 11386 11387 11389 11393 11400 11405 11423 11426 11435 11448 11466 11475 11492 11504 11797 11805 11806 11807 11815 11818 11823 11827 11916 17500 17668 17727 17743 17747 17754 17755 17756 17757 17766 17767 17774 17776 17816 17821 17830 17840 17857 18004 18007 18026 18027 18028 18032 18076 18077 18086 18092 18395 18404 18410 18749 18772 18776 18781 18849 18852 18858 18865 19025 19030 19035 19036 19043 19056 19092 19094 19102 19383 19417 19418 19663 19691 19696 19697 19751 19759 19989 21849 21852 21965 21972 21998 25909 25931 25934 25939 25941 25943 25959 25969 25976 25981 25982 25983 26006 26007 26010 26016 26019 26047 26058 26105 26106 26188 26202 26206 26212 26213 26216 26228 26235 26236 26238 26258 26263 26276 26305 26314 26318 26320 26328 26331 26343 26353 26368 26373 26481 26490 26497 26577 26986 27002 27025 27035 27046 27052 27059 27069 27074 27078 27087 27107 27108 27113 27119 27130 27133 27198 27246 27260 27290 27303 27319 27343 27345 27360 27370 27380 27422 27427 27444 27457 27465 27476 27485 27501 27512 27524 27571 27573 27593 27605 27652 27653 27658 27659 27675 27678 27687 27689 27697 27708 27710 27711 27714 27724 27750 27751 27754 27760 27761 27787 27795 27796 27798 27821 27840 27868 27875 27880 27886 27917 27918 27924 27941 27942 27946 28167 28168 28180 28181 28186 28202 28210 28225 28533 28537 28588 28601 28607 28615 28629 28630 28636 28637 28639 28644 28658 28659 31295 31385 31394 31395 31399 31407 31459 31472 31473 31625 31633 31649 32431 32439 32480 32481 32491 32497 45046 45054https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/791/88?format=asciiOpticaldefaultJ/ApJ/791/88/table6*C IV_sa_ TroughsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDQuasar identifier (QNNN)meta.id;meta.maincharCIVC IV trough identifier (1)meta.id;spect.linecharvmaxMaximum velocitykm/sspect.dopplerVelocdoublevminMinimum velocitykm/sspect.dopplerVelocdoubleDelvVelocity widthkm/sspect.line.widthfloatvcen1First epoch weighted centroid velocity (G1)km/sspect.dopplerVelocdoublevcen2Second epoch weighted centroid velocity (G1)km/sspect.dopplerVelocdoubledBAL1First epoch average depthphot.flux.density;arith.ratiofloate_dBAL1The 1{sigma} uncertainty in dBAL1stat.errorfloatdBAL2Second epoch average depthphot.flux.density;arith.ratiofloate_dBAL2The 1{sigma} uncertainty in dBAL2stat.errorfloatEQ1First epoch equivalent width (G1)0.1nmspect.line.eqWidthfloate_EQ1The 1{sigma} uncertainty in EQ10.1nmstat.errorfloatEQ2Second epoch equivalent width (G1)0.1nmspect.line.eqWidthfloate_EQ2The 1{sigma} uncertainty in EQ20.1nmstat.errorfloatDelEWEquivalent width variation0.1nmarith.rate;spect.line.eqWidthfloate_DelEWThe 1{sigma} uncertainty in DelEW0.1nmstat.errorfloatRatioFractional equivalent variation (2)spect.line.intensity;arith.ratiofloate_RatioThe 1{sigma} uncertainty in Ratiostat.error;arith.ratiofloatJ/ApJ/791/88/table1Main- BAL QuasarsMJD1Modified Julian Date of first epoch observationdtime.epochintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordinttroughsindicates CIV troughs in other tablesmeta.ref.urlcharIDQuasar identifier (QNNN)meta.idcharprimarySDSSQuasar SDSS identifier (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainzRedshiftsrc.redshiftdoublee_zThe 1{sigma} uncertainty in zstat.error;src.redshiftdoubleiMagAbsolute i band magnitude for z = 2magphys.magAbsfloatPlate1First epoch SDSS plate identifiermeta.id;instr.plateintFiber1First epoch SDSS fiber identifiermeta.idintSN1First epoch average Signal-to-Noise (1)stat.snrdoublePlate2Second epoch SDSS plate identifiermeta.id;instr.plateintMJD2Modified Julian Date of second epoch observationdobs.fieldintFiber2Second epoch SDSS fiber identifiermeta.noteintSN2Second epoch average Signal-to-Noise (1)stat.snrdoubleBI1First epoch modified "balnicity" (2)km/sspect.line.eqWidthinte_BI1The 1{sigma} uncertainty in BI1km/sstat.errorintBI2Second epoch modified "balnicity" (2)km/sspect.line.eqWidthinte_BI2The 1{sigma} uncertainty in BI2km/sstat.errorintDeltRest-frame timescaleyrtime.intervalfloatSloanDisplay the online SDSS data for this quasarmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/791/88/table7*C IV_Sa_ TroughsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDQuasar identifier (QNNN)meta.id;meta.maincharCIVC IV trough identifier (1)meta.id;spect.linecharvmaxMaximum velocitykm/sspect.dopplerVelocdoublevminMinimum velocitykm/sspect.dopplerVelocdoubleDelvVelocity widthkm/sspect.line.widthfloatvcen1First epoch weighted centroid velocity (G1)km/sspect.dopplerVelocdoublevcen2Second epoch weighted centroid velocity (G1)km/sspect.dopplerVelocdoubledBAL1First epoch average depthphot.flux.density;arith.ratiofloate_dBAL1The 1{sigma} uncertainty in dBAL1stat.errorfloatdBAL2Second epoch average depthphot.flux.density;arith.ratiofloate_dBAL2The 1{sigma} uncertainty in dBAL2stat.errorfloatEQ1First epoch equivalent width (G1)0.1nmspect.line.eqWidthfloate_EQ1The 1{sigma} uncertainty in EQ10.1nmstat.errorfloatEQ2Second epoch equivalent width (G1)0.1nmspect.line.eqWidthfloate_EQ2The 1{sigma} uncertainty in EQ20.1nmstat.errorfloatDelEWEquivalent width variation0.1nmarith.rate;spect.line.eqWidthfloate_DelEWThe 1{sigma} uncertainty in DelEW0.1nmstat.errorfloatRatioFractional equivalent variation (2)spect.line.intensity;arith.ratiofloate_RatioThe 1{sigma} uncertainty in Ratiostat.error;arith.ratiofloatJ/ApJ/791/88/table2*C IV_00_ TroughsDelvVelocity widthkm/sspect.line.widthfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDQuasar identifier (QNNN)meta.id;meta.maincharCIVC IV trough identifier (1)meta.id;spect.linecharvmaxMaximum velocitykm/sspect.dopplerVelocdoublevminMinimum velocitykm/sspect.dopplerVelocdoublevcen1First epoch weighted centroid velocity (G1)km/sspect.dopplerVelocdoublevcen2Second epoch weighted centroid velocity (G1)km/sspect.dopplerVelocdoubledBAL1First epoch average depthphot.flux.density;arith.ratiofloate_dBAL1The 1{sigma} uncertainty in dBAL1stat.errorfloatdBAL2Second epoch average depthphot.flux.density;arith.ratiofloate_dBAL2The 1{sigma} uncertainty in dBAL2stat.errorfloatEQ1First epoch equivalent width (G1)0.1nmspect.line.eqWidthfloate_EQ1The 1{sigma} uncertainty in EQ10.1nmstat.errorfloatEQ2Second epoch equivalent width (G1)0.1nmspect.line.eqWidthfloate_EQ2The 1{sigma} uncertainty in EQ20.1nmstat.errorfloatDelEWEquivalent width variation0.1nmarith.rate;spect.line.eqWidthfloate_DelEWThe 1{sigma} uncertainty in DelEW0.1nmstat.errorfloatRatioFractional equivalent variation (2)spect.line.intensity;arith.ratiofloate_RatioThe 1{sigma} uncertainty in Ratiostat.error;arith.ratiofloatJ/ApJ/791/88/table4*C IV_SA_ TroughsdBAL2CSecond epoch C IV_SA_ average depthphot.flux.density;arith.ratiofloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDQuasar identifier (QNNN)meta.id;meta.maincharCIVC IV_SA_ trough identifiermeta.id;spect.linecharvmaxCC IV_SA_ Maximum velocitykm/sspect.dopplerVelocdoublevminCC IV_SA_ Minimum velocitykm/sspect.dopplerVelocdoubleDelvCC IV_SA_ Velocity widthkm/sspect.line.widthfloatvcen1CFirst epoch C IV_SA_ weighted centroid velocity (G1)km/sspect.dopplerVelocdoublevcen2CSecond epoch C IV_SA_ weighted centroid velocity (G1)km/sspect.dopplerVelocdoubledBAL1CFirst epoch C IV_SA_ average depthphot.flux.density;arith.ratiofloate_dBAL1CThe 1{sigma} uncertainty in dBAL1Cstat.errorfloate_dBAL2CThe 1{sigma} uncertainty in dBAL2Cstat.errorfloatEQ1CFirst epoch C IV_SA_ equivalent width (G1)0.1nmspect.line.eqWidthfloate_EQ1CThe 1{sigma} uncertainty in EQ1C0.1nmstat.errorfloatEQ2CSecond epoch C IV_SA_ equivalent width (G1)0.1nmspect.line.eqWidthfloate_EQ2CThe 1{sigma} uncertainty in EQ2C0.1nmstat.errorfloatDelEWCC IV_SA_ equivalent width variation0.1nmarith.rate;spect.line.eqWidthfloate_DelEWCThe 1{sigma} uncertainty in DelEWC0.1nmstat.errorfloatRatioCFractional C IV_SA_ equivalent variation (2)spect.line.intensity;arith.ratiofloate_RatioCThe 1{sigma} uncertainty in RatioCstat.errorfloatSiIVSi IV_SA_ trough identifiermeta.id;spect.linecharvmaxSSi IV_SA_ Maximum velocitykm/sspect.dopplerVelocdoublevminSSi IV_SA_ Minimum velocitykm/sspect.dopplerVelocdoubleDelvSSi IV_SA_ Velocity widthkm/sspect.line.widthfloatvcen1SFirst epoch Si IV_SA_ weighted centroid velocity (G1)km/sspect.dopplerVelocdoublevcen2SSecond epoch Si IV_SA_ weighted centroid velocity (G1)km/sspect.dopplerVelocdoubledBAL1SFirst epoch Si IV_SA_ average depthphot.flux.density;arith.ratiofloate_dBAL1SThe 1{sigma} uncertainty in dBAL1Sstat.errorfloatdBAL2SSecond epoch Si IV_SA_ average depthphot.flux.density;arith.ratiofloate_dBAL2SThe 1{sigma} uncertainty in dBAL2Sstat.errorfloatEQ1SFirst epoch Si IV_SA_ equivalent width (G1)0.1nmspect.line.eqWidthfloate_EQ1SThe 1{sigma} uncertainty in EQ1S0.1nmstat.errorfloatEQ2SSecond epoch Si IV_SA_ equivalent width (G1)0.1nmspect.line.eqWidthfloate_EQ2SThe 1{sigma} uncertainty in EQ2S0.1nmstat.errorfloatDelEWSSi IV_SA_ equivalent width variation0.1nmarith.rate;spect.line.eqWidthfloate_DelEWSThe 1{sigma} uncertainty in DelEWS0.1nmstat.errorfloatRatioSFractional Si IV_SA_ equivalent variation (2)spect.line.intensity;arith.ratiofloate_RatioSThe 1{sigma} uncertainty in RatioSstat.errorfloatAiIVAl III_SA_ trough identifiermeta.id;spect.linecharvmaxAAl III_SA_ Maximum velocitykm/sspect.dopplerVelocdoublevminAAl III_SA_ Minimum velocitykm/sspect.dopplerVelocdoubleDelvAAl III_SA_ Velocity widthkm/sspect.line.widthfloatvcen1AFirst epoch Al III_SA_ weighted centroid velocity (G1)km/sspect.dopplerVelocdoublevcen2ASecond epoch Al III_SA_ weighted centroid velocity (G1)km/sspect.dopplerVelocdoubledBAL1AFirst epoch Al III_SA_ average depthphot.flux.density;arith.ratiofloate_dBAL1AThe 1{sigma} uncertainty in dBAL1Astat.errorfloatdBAL2ASecond epoch Al III_SA_ average depthphot.flux.density;arith.ratiofloate_dBAL2AThe 1{sigma} uncertainty in dBAL2Astat.errorfloatEQ1AFirst epoch Al III_SA_ equivalent width (G1)0.1nmspect.line.eqWidthfloate_EQ1AThe 1{sigma} uncertainty in EQ1A0.1nmstat.errorfloatEQ2ASecond epoch Al III_SA_ equivalent width (G1)0.1nmspect.line.eqWidthfloate_EQ2AThe 1{sigma} uncertainty in EQ2A0.1nmstat.errorfloatDelEWAAl III_SA_ equivalent width variation0.1nmarith.rate;spect.line.eqWidthfloate_DelEWAThe 1{sigma} uncertainty in DelEWA0.1nmstat.errorfloatRatioAFractional Al III_SA_ equivalent variation (2)spect.line.intensity;arith.ratiofloate_RatioAThe 1{sigma} uncertainty in RatioAstat.errorfloatJ/ApJ/791/88/table5*C IV_s0_ Troughse_DelEWThe 1{sigma} uncertainty in DelEW0.1nmstat.errorfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDQuasar identifier (QNNN)meta.id;meta.maincharCIVC IV trough identifier (1)meta.id;spect.linecharvmaxMaximum velocitykm/sspect.dopplerVelocdoublevminMinimum velocitykm/sspect.dopplerVelocdoubleDelvVelocity widthkm/sspect.line.widthfloatvcen1First epoch weighted centroid velocity (G1)km/sspect.dopplerVelocdoublevcen2Second epoch weighted centroid velocity (G1)km/sspect.dopplerVelocdoubledBAL1First epoch average depthphot.flux.density;arith.ratiofloate_dBAL1The 1{sigma} uncertainty in dBAL1stat.errorfloatdBAL2Second epoch average depthphot.flux.density;arith.ratiofloate_dBAL2The 1{sigma} uncertainty in dBAL2stat.errorfloatEQ1First epoch equivalent width (G1)0.1nmspect.line.eqWidthfloate_EQ1The 1{sigma} uncertainty in EQ10.1nmstat.errorfloatEQ2Second epoch equivalent width (G1)0.1nmspect.line.eqWidthfloate_EQ2The 1{sigma} uncertainty in EQ20.1nmstat.errorfloatDelEWEquivalent width variation0.1nmarith.rate;spect.line.eqWidthfloatRatioFractional equivalent variation (2)spect.line.intensity;arith.ratiofloate_RatioThe 1{sigma} uncertainty in Ratiostat.error;arith.ratiofloatJ/ApJ/791/88/table3*C IV_S0_ TroughsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDQuasar identifier (QNNN)meta.id;meta.maincharCIVC IV_S0_ trough identifiermeta.id;spect.linecharvmaxCC IV_S0_ Maximum velocitykm/sspect.dopplerVelocdoublevminCC IV_S0_ Minimum velocitykm/sspect.dopplerVelocdoubleDelvCC IV_S0_ Velocity widthkm/sspect.line.widthfloatvcen1CFirst epoch C IV_S0_ weighted centroidkm/sspect.dopplerVelocdoublevcen2CSecond epoch C IV_S0_ weighted centroid velocity (G1)km/sspect.dopplerVelocdoubledBAL1CFirst epoch C IV_S0_ average depthphot.flux.density;arith.ratiofloate_dBAL1CThe 1{sigma} uncertainty in dBAL1Cstat.errorfloatdBAL2CSecond epoch C IV_S0_ average depthphot.flux.density;arith.ratiofloate_dBAL2CThe 1{sigma} uncertainty in dBAL2Cstat.errorfloatEQ1CFirst epoch C IV_S0_ equivalent width (G1)0.1nmspect.line.eqWidthfloate_EQ1CThe 1{sigma} uncertainty in EQ1C0.1nmstat.errorfloatEQ2CSecond epoch C IV_S0_ equivalent width (G1)0.1nmspect.line.eqWidthfloate_EQ2CThe 1{sigma} uncertainty in EQ2C0.1nmstat.errorfloatDelEWCC IV_S0_ equivalent width variation0.1nmarith.rate;spect.line.eqWidthfloate_DelEWCThe 1{sigma} uncertainty in DelEWC0.1nmstat.errorfloatRatioCFractional C IV_S0_ equivalent variation (2)spect.line.intensity;arith.ratiofloate_RatioCThe 1{sigma} uncertainty in RatioCstat.errorfloatSiIVSi IV_S0_ trough identifiermeta.id;spect.linecharvmaxSSi IV_S0_ Maximum velocitykm/sspect.dopplerVelocdoublevminSSi IV_S0_ Minimum velocitykm/sspect.dopplerVelocdoubleDelvSSi IV_S0_ Velocity widthkm/sspect.line.widthfloatvcen1SFirst epoch Si IV_S0_ weighted centroid velocity (G1)km/sspect.dopplerVelocdoublevcen2SSecond epoch Si IV_S0_ weighted centroid velocity (G1)km/sspect.dopplerVelocdoubledBAL1SFirst epoch Si IV_S0_ average depthphot.flux.density;arith.ratiofloate_dBAL1SThe 1{sigma} uncertainty in dBAL1Sstat.errorfloatdBAL2SSecond epoch Si IV_S0_ average depthphot.flux.density;arith.ratiofloate_dBAL2SThe 1{sigma} uncertainty in dBAL2Sstat.errorfloatEQ1SFirst epoch Si IV_S0_ equivalent width (G1)0.1nmspect.line.eqWidthfloate_EQ1SThe 1{sigma} uncertainty in EQ1S0.1nmstat.errorfloatEQ2SSecond epoch Si IV_S0_ equivalent width (G1)0.1nmspect.line.eqWidthfloate_EQ2SThe 1{sigma} uncertainty in EQ2S0.1nmstat.errorfloatDelEWSSi IV_S0_ equivalent width variation0.1nmarith.rate;spect.line.eqWidthfloate_DelEWSThe 1{sigma} uncertainty in DelEWS0.1nmstat.errorfloatRatioSFractional Si IV_S0_ equivalent variation (2)spect.line.intensity;arith.ratiofloate_RatioSThe 1{sigma} uncertainty in RatioSstat.errorfloat