Add back the variables for the LowPtPLV

Merged Fudong He requested to merge fuhe/athena:Bugfix_for_LowPtPLV_21.2 into 21.2

This is a bug fix, adding back the variables that the LowPtPLV tool needed.

This change should go in the release before a next cache is built.

@fuhe and @rustem will be responsible to this change.

Edited by Fudong He

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