These are the models we used in Leiden.

ccurve.in
this does a collisional ionization cooling function and is an example of using the "grid" to compute a number of models.
ccurve.vsx is the veusz plotting program file we used to plot the results.

During class I forgot to include galactic background cosmic rays.  As a result the code struggled to converge the sims at low temperatures where the gas has a significant molecular content.  The cosmic ray background is needed for the chemistry to converge at low temperatures.

orion_hii_open.in
This is the Orion Nebula model from the test suite - if you download a copy of the code it will be in cloudy / tsuite /auto
star_kurucz_39600.dat is a Kurucz Atlas stellar atmosphere emergent SED.  This is used to photoionize the H II region.  The outer radius of the cloud is set by the point where the gas kinetic temperature falls below 4000 K - the default lowest kinetic temperature the code will consider.

orion_hii_pdr.in
This is a somewhat similar model to orion_hii_open.in but includes the PDR by lowering the lowest allowed temperature, which extends the calculation into warm / cold regions containing atomic and molecular hydrogen.