equilibrium problem
add sounder example
change planck
friday diff_toa checkin
revert planck.py
add docstring
add brightness temperature script
add new bright script
add test for planck function
new test code
bright_lapse_toa.py
revert planck.py
add docstring
update planck.py
monday
planck.py passes tests
add mp script
checkpoint
doppler code
add radar problem