_scale_back(self, update_heap_pointers=True)
If update_heap_pointers
is :None:None:`False`, this will leave all the heap pointers in P/Q columns as they are verbatim--it only makes sense to do this if there is already data on the heap and it can be guaranteed that that data has not been modified, and there is not new data to add to the heap. Currently this is only used as an optimization for CompImageHDU that does its own handling of the heap.
Update the parent array, using the (latest) scaled array.
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