Change or Set the MS this MSRange refers to. The 2nd argument is mainly for internal use by the MS DO, providing incorrect values could cause runtime failures. Return the range of values for each of the items specified in the record. See the enum description in MSSelector for the list of supported items. Correct for one-based indexing if oneBased is True.
Actual memory used is higher due to temporaries and caching.
This function reads the data in blocks of size blockSize, as set by the setBlockSize function. Get the range of interferometer numbers given the antenna1 and antenna2 columns.