If the anymaps are not all the same height (left-right) or width (top-bottom),
the smaller ones have to be justified with the largest.
By default, they get centered, but you can specify one side or the other
with one of the -j* flags.
So,
-topbottom -jleft
would stack the anymaps on top of each other, flush with the left edge.
The
-white
and
-black
flags specify what color to use to fill in the extra space
when doing this justification.
If neither is specified, the program makes a guess.
All flags can be abbreviated to their shortest unique prefix.
