Dear Shaofei Wang,
I didn’t know what to make of your question 2, but a private mail from Patrick
gave me the right clue.
I think the behaviour you see is correct, although unintuitive. The reason is
that the self-broadening parameter of water vapor is a lot larger than its
broadening paramete
Hi again,
We were not aware of the first point, but this indeed look like an issue
of numerical precision.
We derive tau from transmissivity. I did a test in Matlab. exp(-740) is
> 0, while exp(-750) gives 0. This fits what you report reports, that
optical thicknesses above 750 can not be re
