Draw the maglim from the mask.

def drawMask(self,ax=None, mask=None, mtype='maglim'):
        """ Draw the maglim from the mask. """
        if not ax: ax = plt.gca()
        if mask is None:
            mask = ugali.analysis.loglike.createMask(self.config,roi=self.roi)

        mask_map = hp.UNSEEN*np.ones(hp.nside2npix(self.nside))
        if mtype.lower() == 'maglim':
            mask_map[mask.roi.pixels] = mask.mask_1.mask_roi_sparse
        elif mtype.lower() == 'fracdet':
            mask_map[mask.roi.pixels] = mask.mask_1.frac_roi_sparse
        else:
            raise Exception("Unrecognized type: %s"%mtype)
        masked = (mask_map==hp.UNSEEN) | (mask_map==0)
        mask_map = np.ma.array(mask_map,mask=masked,fill_value=np.nan)

        im = drawHealpixMap(mask_map,self.lon,self.lat,self.radius,coord=self.coord)

        try: cbar = ax.cax.colorbar(im)
        except: cbar = plt.colorbar(im)
        cbar.ax.set_xticklabels(cbar.ax.get_xticklabels(),rotation=90)
        ax.annotate(mtype,**self.label_kwargs)
        return im