AIPS HELP file for QUANTIZE in 31DEC18
As of Sun Apr 22 17:57:23 2018
Type: Adverb (Scalar)
Use: Specifies the quantization level to be used. A quantized
collection of numbers is more compressible and will have only
marginally greater noise if the quantization level is well
chosen. Larger quantization levels will produce better
compression but can destroy real information if they are too
high. QUANTIZE < 1/4 sigma causes only 1-2 percent increase in noise.
Null value: 0 => no quantization.
FITAB....Writes data in FITS format to tape and disk. QUANTIZE is
used to quantize images before writing them in integer or