This file explains the symbols used for various physical parameters in our data files. Attached along with this read me file is attached two files for each model f1(1-4) and v1(1-4). The first file (eniding in lei) gives the abundances, heating and cooling rates, dissociation rates, depth, visual extinction, and temperature (when pertinent). PLEASE PLOT OUR RESULTS USING THE AV(extend) COLUMN!!!!! The second file (ending in lin) gives line intensities in units of ergs s-1 cm-2 str-1 for important fine structure lines along with H2 line intensities. The ordering and symbols used in the intensity file is explained in the lines output file. The symbols for our other file, containing the physical parameters mentioned above, is listed below. In our models we do not get a correct electron density if we do not include Si and Fe. Therefore, we have included both elements in our models, even though the models were pre-defined to have only H, He, C, and O. We have also not included the UMIST database sent in the e-mail. This is because the way our code is set up now it would take a complete restructuring of our molecular network to incorporate this. This would likely take longer than the time remaining before the meeting begins. Instead, we are attaching a separate file that includes a majority of the reactions in our chemical network. This is named "chemical_network.txt". There also needs to be changes to the original pdf file that details what each code can do. We have marked in red places that should be checked for our code. The reason for the initial confusion is that we answered the questions for a specific model and not for generalities. Meaning of symbols for file containing all physical parameters except line intensities: depth: Depth into cloud in centimeters AV(point): Visual extinction in magnitudes of a point source (not discounting forward scattering) AV(extend): Visual extinction in magnitudes of an extended, diffuse source (discounting forward scattering) Te: Electron temperature in Kelvin ^ H0: Density of neutral atomic hydrogen (all densities in units of cm-3) H+: Density of ionized hydrogen H2: Density of Molecular Hydrogen Co: Density of neutral atomic Carbon C+: Density of ionized Carbon Oo: Density of neutral atomic Oxygen CO: Density of Carbon Monoxide CH: Density of CH OH: Density of OH H2(Sol): Dissociation rate of Molecular Hydrogen due to Solomon process H2(FrmGrn): Formation rate of Molecular Hydrogen on grain surfaces G0(DB96): Flux of UV continuum between 11.3-13.6 eV rate(CO): Dissociation rate of CO rate(C): Photoionization rate of C heat: Total heating cool: Total cooling GrnP: Heating due to grain photoionization COds: Heating due to Carbon Monoxide photoionization H2dH: Heating due to Molecular Hydrogen dissociation H2vH: Heating due to collisions with Molecular Hydrogen ChaT: Heating due to charge transfer CR H: Heating due to cosmic rays MgI: Heavy element heating, Magnesium SI: Heavy element heating, Sulpher Si: Heavy element heating, Silicon Fe: Heavy element heating, Iron Na: Heavy element heating, Sodium Al: Heavy element heating, Aluminum C: Heavy element heating, Carbon C610: Cooling due to [C I] 610 micron line C370: Cooling due to [C I] 370 micron line C157: Cooling due to [C II] 157 micron line O63: Cooling due to [O I] 63 micron line O146: Cooling due to [O I] 146 micron line Cloudy only converges quantities that affect the physical conditions. In the constant temperature case, heating and cooling are not balanced and there is no need to converge the heating to high accuracy. This introduces some noise in the H2 collisional deexcitation heating, since the level populations are converged to a tolerance that ensures an accurate spectrum, but the heating is not converged. This is not an issue in the thermal balance models since heating and cooling related quantities are converged in this case. We have put a great deal of work into the grain treatment. This includes resolution of the grain size distribution into many size bins, with grain temperature, potential, etc, all determined self-consistently for each bin. Quantum heating is treated when important. H2 formation on grain surfaces is done self-consistently in the context of this solution of the grain properties. The H2 dissociation rate treats pumping to all rotational/vibrational levels.