Which font/typeface being used for the diagrams?

[TSSlade]

When trying to compile to PDF from RST using pandoc, I've been encountering several error messages of this type:

[WARNING] Missing character: There is no ΓÇà in font [lmroman10-mono]

Other glyphs that render improperly or not at all include Γêæ, π, Γêç. These seem mostly to be the borders of the tables that are in the various diagrams at the end of the book.

Which font was used when writing the book? I'd like to be able to hunt down which specific unicode is failing to render properly and recompile using a font that isn't missing those glyphs.

[rougier]

The font is "Source Code Pro" I think (need to check the CSS), it is freely available.
But those unicode block character are pretty common in a lot of fonts and maybe the problem is only a unicode encoding problem.