In the last example (in §) both axis coordinates
and pixel indices were mixed in the same subscript expression. In fact, any of
the features described earlier may be combined when specifying an NDF section,
the only restriction being that when the shape of the resulting section is
expressed in pixel indices, the lower bound must not exceed the upper bound in
any dimension. Thus, all the following might be used as valid specifications for
NDF sections:
ndf(3.7)
ndf(,5:)
ndf(-77:13.8,,4)
ndf(66
9,4:17)
ndf(
5,6
)
ndf(
,:)
ndf(5500.0
150,)
ndf(3.0
1.5,-78.06D-3:13.0545,,,,)
Many other combinations are obviously possible.