The Isodose window controls the display of isodose lines and surfaces.
You can also control isodose displays from the Isodose menu.

The Isodose button selects an isodose file. Click this button to open an isodose file. You can also open isodose files from the Isodose menu or even the File Menu. Control clicking (or right mouse button) on this button is a shortcut to the Isodose Files Menu. The Colors button selects an isodose colors file. Click this button to open a colors file. You can also open color files from the Isodose menu or even the File Menu. Control clicking (or right mouse button) on this button is a shortcut to the Color Files Menu. The Dose units popup menu simultaneously switches all of Plaque Simulator's isodose and prescription units. The Normalize at checkbox normalizes the isodose display to a user defined value (1.0 by default) at the point selected in the popup menu. The default normalization point is the prescription (Rx) point. The checkboxes in the legend select which isodose lines are plotted on 2D dosimetry surfaces. The Radio buttons select the isodose surface which is rendered three dimensionally in the Setup window. To change an isodose color double-click on the sample color box to the right of the radio buttons. This will open the MacOS Color picker.

To edit an individual isodose value click on the text in the column closest to the color boxes. An editable text field will appear. Enter the new value. The return key accepts the new value. The enter key accepts the new value and advances to the next isodose. The tab and up/down arrow keys advance to the next isodose without accepting the change. Click away from the text to abort editing. If you double-click anywhere else the window the Custom Isodoses dialog will open.