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		  attoparsec         => 149597870700*648000/$PI/1e18,
		  apc                => 149597870700*648000/$PI/1e18,
		  planck             => 1.61619997e-35, #planck length
		  #Norwegian (old) lengths:
		  tomme         => 0.0254,
		  tommer        => 0.0254,
		  fot           => 0.0254*12,               #0.3048m
		  alen          => 0.0254*12*2,             #0.6096m
		  favn          => 0.0254*12*2*3,           #1.8288m
		  kvart         => 0.0254*12*2/4,           #0.1524m a quarter alen
                  #--https://upload.wikimedia.org/wikipedia/commons/e/eb/English_length_units_graph.svg
                  twip          => 0.0254 / 6 / 12 / 20,
                  point         => 0.0254 / 6 / 12,
                  pica          => 0.0254 / 6,
                  line          => 0.0254 / 12,
		  thou          => 0.0254 / 1000,
                  barleycorn    => 0.0254 / 3,
                  poppyseed     => 0.0254 / 3 / 4,
                  finger        => 0.0254 / 6 / 12 * 63,
                  palm          => 0.0254 * 3,
                  digit         => 0.0254 * 3 / 4,