(a) Emission altitude of the emission point for PSR B1929+10 under the assumption of the rotating magnetosphere approximation. The aberration effect has been taken into account. The emission altitudes are described by the colors and are measured in units of the light cylinder, R_LC, of this pulsar. (b) To further investigate the emission geometry, we calculate and plot the curvature radius of the emission point, as the color bar indicates. The R_LC is about 10 807km.