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pnStudy: Ambient Temperature close to Jet drops

Trying to figure out the ambient temperature where close to the jet drops for the pnStudy module (blog:bliu11102014). This hasn't been found before (From Keira's runs). Here I tried to reproduce one of Bruce's runs and also a run of Keira. For Bruce's run, the ambient temperature is 1000K, and the temperatures close to the jet drops to 100K around 660y. For Keira's run, the ambient temperature is 100K. And the temperature of similar area doesn't drop — as listed in 1 and 2 below.

A. Cooling Floor Temperature

Jonathan helped me figure out the cooling played a role here. The floor temperature for the cooling is 100K and when it reaches 100K it shuts off the cooling. That's why in Keira's case, it won't see the drop. But whenever the ambient temperature is higher than 100K, there is a drop

B. Misleading comments in problem.data

It was also found the comments for the temperature parameters in the problem.data was misleading. Here's the current problem.data

!      BACKGROUND or “AMBIENT” SECTION. Values apply to origin
tamb = 1d3           ! ambient temp, 1cu = 0.1K (100K=1000cu)     

...

tjet  = 1000d0      ! flow temp, 1cu = 0.1K (100K=1000cu)

Both of these should be in Kelvin and 1 cu = 10K

!      BACKGROUND or “AMBIENT” SECTION. Values apply to origin
tamb = 1d3           ! ambient temp in Kelvin ( 1cu = 10K)

...

tjet  = 1000d0      ! flow temp in Kelvin ( 1cu = 10K)