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FITSH tools on big images (> 1Gb each) ( stefanocovino | 2016 february 22., mon - 16:29 )

Hello everybody,
I am trying to use some of the FITSH tools on ESO-VST frames. These frames are rather big, larger typically than 1Gb, and indeed I only get an error message:
$fistar bigVSTframe.fits fistar(65898,0x7fff76180000) malloc: *** mach_vm_map(size=18446744072133750784) failed (error code=3) *** error: can't allocate region *** set a breakpoint in malloc_error_break to debug Segmentation fault
I guess the "malloc" error is associated to the memory size of the data. Is there anything I can do?
Cheers, Stefano