and area) so that they are consistent across commands. The default
behavior remains the same, for backwards compatibility. However, a
new "units" command has been added, so that "units microns" results
in measurements always being displayed in microns, with choice of
that or "internal", "lambda", or "grid". The units themselves may
be printed (for interactive use) or not (for scripted use). The
use of "units" is independent of "snap", after overriding the
default behavior, so that units parsed on the command line are
interpreted according to "units", not to "snap".
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