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(Stephens) They belong in the definition as they can be in the file, Even if they are not there in the
files delivered from the data server.
(Hirayama) Those columns became "permanent" to avoid multiple variants of the FT1 definition. In fact, it is not recommended (by the HEASARC FITS Working Group members) for a tool to change a file format by adding those columns. (See also my comment for "5. MC_TRUTH keyword.") Personally I like it better if pulsar tools add those columns when necessary, but I also see their point, especially thinking about archiving those files for future use. So, if we need/want to drop them, probably we should talk to them about our plan.
12. SKYX/Y issue
(Digel) The Guidelines for Science Tools Design page lists one outstanding issue for the definition of the events file, whether to add columns that give the coordinates of the events in some coordinate projection.
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