# $ctx->{Trans}{Y} # new origin. (is applied at _input_
# $ctx->{Trans}{A} # not at plot-time)
# $ctx->{Trans}{R} # but multiply all y coords by this!
-# $ctx->{Draw} # sequence of 0 or more of:
-# # restrictions: T => !C, L => M
-# $ctx->{Draw}{T} # 1 or T for drawing track or thin lines, or ''
-# $ctx->{Draw}{L} # L1 or 1 for labelling or drawing locs, or ''
+# $ctx->{Draw} # sequence of one or more chrs from uc $drawers
#
# $objs{$id}{CmdLog}
# $objs{$id}{Loc}