  Distance versus dispersion measure relations are constructed for Galactic
radio pulsars in small solid angle intervals. The calculations are based on
some basic criteria as well as using the independent distance measurements of
well examined pulsars for the first Galactic quadrant including Galactic
central directions. Values of average free electron density for these regions
are derived from the fits to distance versus dispersion measure relations and
checked for consistency and smoothness. The effects of plasma in the Galactic
arms and within the central parts of the Galactic bulge region are also
compared and discussed. Our adopted distances for the radio pulsars are
compared with the ones given in some other models. Some basic results on
distributions of the radio pulsars and the plasma are presented.
