The 6-GHz multibeam maser survey III: comparison between the MMB and
  HOPS
  We have compared the occurrence of 6.7-GHz and 12.2-GHz methanol masers with
22-GHz water masers and 6035-MHz excited-state OH masers in the 100 square
degree region of the southern Galactic plane common to the Methanol Multibeam
(MMB) and H2O southern Galactic Plane surveys (HOPS). We find the most populous
star formation species to be 6.7-GHz methanol, followed by water, then 12.2-GHz
and, finally, excited-state OH masers. We present association statistics, flux
density (and luminosity where appropriate) and velocity range distributions
across the largest, fully surveyed portion of the Galactic plane for four of
the most common types of masers found in the vicinity of star formation
regions.
  Comparison of the occurrence of the four maser types with far-infrared dust
temperatures shows that sources exhibiting excited-state OH maser emission are
warmer than sources showing any of the other three maser types. We further find
that sources exhibiting both 6.7-GHz and 12.2-GHz methanol masers are warmer
than sources exhibiting just 6.7-GHz methanol maser emission. These findings
are consistent with previously made suggestions that both OH and 12.2-GHz
methanol masers generally trace a later stage of star formation compared to
other common maser types.
