The value of the FitsAxisOrder attribute can be either
(the default value),
or a space-separated list of axis symbols:
: causes the WCS axis order to be chosen automatically so that the i
’ th WCS axis in
the new FITS header is the WCS axis which is more nearly parallel to the i
’ th pixel
" Sym1 Sym2...
" : the space-separated list is seached in turn for the Symbol attribute
of each axis in the current Frame of the FrameSet. The order in which these Symbols
occur within the space-separated list defines the order of the WCS axes in the new FITS
header. An error is reported if Symbol for a current Frame axis is not present in
the supplied list. However, no error is reported if the list contains extra
words that do not correspond to the Symbol of any current Frame axis.