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XSHOOTER has a set of telluric standards to be acquired within 2 hours of a science OB. These data are processed by the pipeline and analyzed on the fly by a routine which measures the equivalent width of all telluric lines in a specified window. The results are transformed into PWV values using a curve-of-growth. This method is called WLAMBDA method and has been implemented by Reinhard Hanuschik.
For UVES, the set of flux standard stars measured for efficiency monitoring are evaluated by a similar method.
Find here the current WLAMBDA plots from XSHOOTER telluric spectra and from UVES flux standard spectra:
2010 | 2011 | 2012 |
2013 | 2014 | 2015 | 2016 | 2017