newfits is a utility for creating a new FITS file, with or without data
following the header. BITPIX defaults to zero so that the WCSTools FITS
reading software will not attempt to read the data portion of the file,
even if the NAXISx keywords are set.
If the -o argument is used to set a BITPIX value, either a data section filled
with zeroes of the appropriate data type is appended to the header, or
if the -i argument is used to specify a file, the data section is filled
from that binary file.
By default, all files are two dimensional, though the second dimension
can be one.
Files cannot be overwritten.
edhead can be used to change keyword values
once a header file has been created. (Added in WCSTools 2.6)