Once the Concentration Setup menu has been closed with the Save button, the changes to the simulation parameters are
copied to default_conc. Clicking on the Run Standard Model menu tab first copies default_conc to CONTROL and then
runs the trajectory model executable, hycs_std. The executable, by default, attempts to open a file named CONTROL to
read all the required input parameters. If not found, the model will prompt to standard output for values from standard
input. This condition should not occur running the model through the GUI.