This code simply expands on the basic idea and is run as a bash file:


awk '{print "set label",FNR, "\"",$1,$2,"\"","at", $2*3.30908",0.4 rotate"}' test.dat > show.p

awk '{print "set arrow",FNR,"from", $2*3.30908",0 to ",$2*3.30908",1.2 nohead linetype 3"}' test.dat >> show.p

When run, the bash file creates show.p that is loaded in gnuplot before plotting the Keck data file to produce:


Here is the same echelle order but using the Iodine cell and it shows the utility of marking the absorption lines:


It is easy to see that only FeII is present in these data sets.

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