When trying to assign a very large array (fltarr(182,21,8,35,9,9,12)) using the construct:: array1[0]=array2 I'm finding that only part of the array is filled in, on the other hand: array1[*]=array2 uses 3 times the total space of the array at peak. [N.B. the array1=array2 form can't be used as the target is in a shared memory segment] Is this a known limitation or a bug??