Density dependence of the line source functions in scattering media

We have calculated source functions in a scattering medium in which the density changes according to the law ofN _e (r)～r ⁿ wheren takes the value from ?3 to +3(1) andN _e (r) is the electron density. We have assumed that the media consist of electrons and we have also considered a geometrically extended media in which the outer radii are 2, 3, 5 times the inner radius. The source functions obtained are completely due to electron scattering. It is found that the source function varies considerably for different variations of density changes fromn=?3 to +3. In the case of density variation withn=?3 and ?2, the source functions do not increase with optical depth considerably, but whenn=?1, 0, they rise slowly with the increase in optical depths and whenn=1 to 3 there is a steep rise in the source functions with the optical depth increasing towards the center of the star.