The Millennium Arecibo 21-cm Absorption Line Survey: Extolling the   Analysis Procedures
  We have recently completed the analysis of a survey of the HI line in emission/absorption against 79 radio sources. Our CNM temperatures are about half those of previous authors and we find a substantial quantity of thermally unstable WNM. These results are somewhat controversial. Here we discuss the analysis procedures to illustrate explicitly why the results are reliable. 
Carl Heiles