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my @colors = qw/grey purple pink blue turquoise green
                chartreuse yellow gold orange/;
...
1e-3
0
1e-99

1e-10 ==> purple ==> 1e-20 < E < 1e-10
1e-33 ==> blue ==> 1e-40 < E < 1e-30
...
1e-3 ==> grey ==> 1e-10 < E < 1e-00
0 ==> red ==> E = 0
1e-99 ==> orange ==> 1e-100 < E < 1e-90