saxsdata.saxs_read() -- Read in SAXS data

filename = <str:1>

Filename of experimental SAXS data; ascii file contains 3 columns: spatial frequency $s$ in Å$^{-1}$ , Intensity, and experimental error (if determined). Comments start with '#'.

Read in SAXS data. Make sure that sampling of $s$ is the same as specified in saxsdata.ini_saxs().