+barcat input/unvalued.txt
nan
-1 negative -------
-2 negativer
- 0 zero ------------=|-
- .0 zeroer ------------=|-
--00 zeroest ------------=|-
+ 0 zero -----------<=-|
+ .0 zeroer -----------<=-|
+-00 zeroest -----------<=-|
-1.5 positive ------------=|------------
+1.5 positive -----------<=-|-----------