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Since the launch of the Large Area Telescope (LAT) on board the Fermispacecraft in June 2008, the number of observed gamma-ray pulsars has increaseddramatically. A large number of these are also observed at radio frequencies.Constraints on the viewing geometries of 5 of 6 gamma-ray pulsars exhibitingsingle-peaked gamma-ray profiles were derived using high-quality radiopolarization data (Weltevrede et al., 2010). We obtain independent constraintson the viewing geometries of 6 by using a geometric emission code to model theFermi LAT and radio light curves (LCs). We find fits for the magneticinclination and observer angles by searching the solution space by eye. Ourresults are generally consistent with those previously obtained (Weltevrede etal., 2010), although we do find small differences in some cases. We willindicate how the gamma-ray and radio pulse shapes as well as their relativephase lags lead to constraints in the solution space. Values for the fluxcorrection factor corresponding to the fits are also derived (with errors).

Constraining viewing geometries of pulsars with single-peaked gamma-ray profiles using a multiwavelength approach