Version 5.9 of O generates its plot metafiles in oplot format, and consequently, the strategy for generating Plots from O has changed. You start by choosing Plot_on. This sets a flag internally in the program, which causes all drawing instructions, which would normally go to the graphics subsystem, to also be dumped to a file. All objects created in O from now on are dumped to the file, which grows very quickly. Therefore, to ensure that you do not forget that Plot_on is active, the dials have been deactivated. When the required objects have been drawn to the screen, Plot_off is selected; this closes the plot metafile, and reactivates the dials.
The template name of the plot metafile is defined in Plot_setup, and it can optionally contain a format string, which is replaced by an integer that is incremented by 1 each time a new plot is initiated.
For making Quick n' Dirty plots, the Plot command can be used. It is restricted in several ways. It ONLY plots molecules and maps, and colours are not used.