Comment by gnufx

That's reporting better figures with general compression than I'd expect from experience. Anyway, I'd expect to reach for zfp.io for arrays of floating point data. It's certainly an old observation that the compression method you want to use is data-dependent, even for similar kinds of data. Long ago it was found that there was a dramatic difference in x-ray crystallography image data depending on whether they were taken with a lab source (low resolution) or at a synchrotron (high resolution -- sharper peaks).