By the way, another weird little quirk which doesn't seem to be
mentioned in my admittedly brief read of the documentation: if your
diagram goes beyond the default width as understood by pic then it
starts scaling the image automatically! It's really baffling when it
first happens - you make your boxes wider and instead of getting wider,
the height shrinks.
Setting maxpswid to some suitably large value prevents this behaviour.
Cheers,
Dave
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