  Three Galactic HII regions, viz., S 201, S 206, and S 209 have been imaged at
three frequencies, viz., 232, 327, and 610 MHz using the GMRT. The resolutions
of these images are typically 15" at 232, 10" at 327, and 6" at 610 MHz. These
are the highest resolution low frequency images of these HII regions. We found
that all three HII regions have core--envelope morphologies. We use the high
resolution afforded by the data to estimate the electron temperatures of the
compact cores of these HII regions. These estimates of the electron
temperatures are consistent with an increase in the temperature with
Galacto-centric distance; an effect attributed to a decrease in the heavy
elements abundances at large Galacto-centric distances.
