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If the value of SK_SKIP_SKIM is "true", no real skimming will take place. This is useful when someone only want to generate some of the parameter files defined by SK_OUTPUT_FILE_LIST, SK_OUTPUT_LIBRARY_LIST, SK_OUTPUT_EVENT_LIST or SK_OUTPUT_BRANCH_LIST.

If the events have been cut (thanks to SK_INPUT_EVENT_LIST or SK_TCUT) and SK_OUTPUT_CEL is defined, no deep copy of data will take place. Instead, the skimmer will create a ROOT CEL file which is giving the list of valid files and entries for each relevant data type. In this case, the pruning of branches will not be applied. The relevant data types are the ones which have a branch giving the run id and a branch giving the event id. For other data types, the usual merging of files will take place, even if SK_OUTPUT_CEL is defined, because the CEL format does not support yet such kind of data.

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