Compression of Infocubes

Question: I need to run compression for the first time on a number of infocubes.
I ran program SAP_DROP_EMPTY_FPARTITIONS and I see lots of partitions that have -1 in the reqid as below.
/BIC/FZPA0000000015 14 1- 100,666 (may be dropped DIM)

Is it advisable to drop these before doing the compression or should I compress the cube first and then drop what remains.
I am assuming I should do it first as it would speed up the compression.
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Oh so that what that button does

Answer:
Running this report but still haven't built up courage to hit DO DROP!

Can someone explain why the partitions are in this 1- status.

Are these requests that have been deleted from the cube but the partition still exists on the F table but is not available for reporting.

Don't like deleting things in case I might be wrong.
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Oh so that what that button does
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