Plot doesn't become monochrome in pdfcairo with 'mono' option.
set term pdfcairo mono
set output "test_output.pdf"
Texts and objects are drawn in monochrome,
but lines and points example are drawn in color.
It also occurs in pngcairo terminal.
My environment is,
G N U P L O T
Version 4.7 patchlevel 0 last modified 2013-03-02
Build System: Darwin x86_64
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