  The Large Area Telescope aboard the Fermi spacecraft has detected more than
200 $\gamma$-ray pulsars since its launch in 2008. By concurrently fitting
standard geometric model light curves onto Fermi and radio data, researchers
have constrained the inclination and observer angles of a number of pulsars. At
first this was done by comparing observed and modelled light curves by eye, and
later via statistical approaches. We fit modelled light curves of 16 pulsars to
radio and $\gamma$-ray data by optimising a custom test statistic that we have
developed for combining light curves across the two wavebands, taking their
disparate errors into account. We present geometrical constraints found using
this process, and compare them with results found by eye or using other
statistical methods.
