[proto-n]

To be fair, they mostly advise against GNUplot, and mention Gnuplot because of the aversion to start sentences with lowercase (which is also where they use it with uppercase).

[iso1210]

Doesn't explain

  8.4 Why does gnuplot ignore my very small numbers?
  For some purposes Gnuplot treats numbers less than 1e-08 as being zero....

[perfopt]

Proper nouns should begin with a capital letter?

[apricot]

But only in answers, not in questions.

[iso1210]

Later in that same answer:

  The solution is to change gnuplot’s idea of "zero"

:D

[utopcell]

:-)