Plotting 3D or 2D graphics for time-varying measures

In order to plot the transient measure of interest with time the following steps should be followed:

1. Solve the model using a transient analytical method. Select, for instance, the Transient/Point Probabilities/Uniformization tab, under the Analytical Methods window, and fill in the parameters. Then click on the Evaluate button.
2. On the Measures of Interest window, select more than one file for the State Probabilities File Name (for instance all files with TS.pp extension). The selection is done by holding the shift (or control) keyboard button and clicking the mouse left button. Note that several names will appear in the State Probabilities File Name window. If you want to generate a file to be plotted in 3D, you have to select one of the following options: ``PMF of one or more state variables'', ``Function of state variables'', or ``Probability of a set'' and click on the Evaluate button. Then a file with a .3d extension will be generated.
3. On the Measures of Interest window, click on the Plot button. There are two options:
   1. Select a file with the .3d extension and click on the GNUPlot button. Then a 3D graph will be shown, representing, for instance, the evolution of the probability mass function with time of the previously selected state variable.
   2. If, instead, you select multiple input files by holding the shift or control keys, and then clicking on the GNUPlot button, a 2D graphic will be plotted with all selected files. Note that GNUplot has a pre-defined sequence of colors for graphics with multiple functions. The order the files are selected determines the sequence of colors used in the plot.

The user is encouraged to solve the simple MM1k example to familiarize him/herself with all the features and the solution files generated by Tangram-II.