Water abundance in four of the brightest water sources in the southern
  sky
  We estimated the ortho-{\rm{H$_2$O}} abundances of G267.9--1.1, G268.4--0.9,
G333.1--0.4 and G336.5--1.5, four of the brightest ortho-{\rm{H$_2$O}} sources
in the southern sky observed by the Submillimeter Wave Astronomy Satellite
(ortho-{\rm{H$_2$O}} 1$_{10}$ -- 1$_{01}$ line, 556.936~GHz). The typical
molecular clumps in our sample have H$_2$ column densities of $10 ^{22}$ to $10
^{23}${\,}cm$^{-2}$ and ortho-{\rm{H$_2$O}} abundances of 10$^{-10}$. Compared
with previous studies, the ortho-{\rm{H$_2$O}} abundances are at a low level,
which can be caused by the low temperatures of these clumps. To estimate the
ortho-{\rm{H$_2$O}} abundances, we used the CS $J = 2 \to 1$ line
(97.98095~GHz) and CS $J = 5 \to 4$ (244.93556~GHz) line observed by{ the}
Swedish-ESO 15\,m Submillimeter Telescope (SEST) to calculate the temperatures
of the clumps and the 350~$\upmu$m dust continuum observed by{ the} Caltech
Submillimeter Observatory (CSO) telescope to estimate the H$_2$ column
densities. The observations of {\rm{N$_2$H$^+$}} ($J = 1 \to 0$) for these
clumps were also acquired by SEST and the corresponding abundances were
estimated. The {\rm{N$_2$H$^+$}} abundance in each clump shows a common
decreasing trend toward the center and {a} typical abundance range from
10$^{-11}$ to 10$^{-9}$.
