Title Rotation For regular titles and chemical symbols, the title rotation is specified with instruction 302. The lettering base line for all lettering is rotated counterclockwise by an angle theta, in degrees, from the x axis of the plotter. For example, if DISP is greater than 0., the forward half of the principal plane trace of ellipsoids is drawn heavier than the hidden half so the eye does not confuse the two halves. Retracing can be turned on with the 303 instruction, using a value for DISP greater than 0. Ellipse Smoothness Instruction 304 may be used to adjust the smoothness of the plotted ellipses as a function of their size.
Smoother ellipses require more computational time and produce larger illustration files.
Smaller smoothness factors produce smoother ellipses, and larger values produce ellipses with more jaggies.