How to use underscores with pgfplotstable?

Question

I have an input file like this:

some_entry 123
another_entry 456
yet_another_entry 789

and I want to typeset it as a table with:

\pgfplotstabletypeset[col sep=space]{FILENAME}

Problem is that LaTeX seems to interpret the underscores as a command to typeset subscript.

Escaping the underscores in the input file does not work.

Answer 1

\pgfplotstabletypeset[col sep=space,columns/colname1/.style={string type}]{FILENAME}

And the file should look like that:

colname1 colname2
some\_entry 123
another\_entry 456
yet_another\_entry 789