combining exposure maps of different obsID

From: JunXian Wang (jxw@pha.jhu.edu)
Date: Wed Jan 03 2001 - 17:51:59 EST

Hi.

I know that "combine_obsid" can be used to combine events files of
differen obsID. But who of you has any idea on how to combine exposure
maps of different obsID?

Thanks a lot.

Junxian

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