The following processing schemes exist for the history of the XSHOOTER processing:
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Name	     applicable dates      comment
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XSHOOT_R     2009-10 ... 2015-04   processing of the SLIT science data (first release)
XSHOOT_TELL  2009-10 ... 2017-05   processing of the SLIT telluric standard stars 
                                   (DPR.CATG=STD,TELLURIC) (additional release)
XSHOOT_R2    2015-05 ... 2017-05   processing of the SLIT science data 
                                   with improved reduction of NIR data and fixed issue 
                                   with nodding data (second release)
             2017-06 ... now       common processing of tellurics and science data in the 
                                   scheme XSHOOT_R2