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Use the Main Tracks Dialog to set these parameters.

TRACK FRame { Use | Ignore | }

Use the track extents in determining scaling of line drawings or not. No argument tells about current state.

TRACK RESOlution { MIn M | MAx N User_units U | Close X }

Parameters to control the resolution of the particle tracks. For each straight line track segment between 2 events, the segment is broken up into pieces of length U. The length and number are adjusted, if necessary, so that the number is between M and N. A subsegment is not shown if either end is hidden. The defaults are M =30, N =80, and U =0.1.

Points CLOSEr than a distance X (in user units) to a starting point for a segment are ignored when plotting a track; the length of each segment is thus at least X. All points are used when X <0 (the default condition).

TRACK STep [ ON | OFf ]

In the step mode, Sabrina shows a message dialog reporting the number of the history just displayed. Selecting Yes in the dialog shows the next history. Selecting No terminates the displaying.

Linux Difference: The Linux version uses the input area rather than the Question popup. After each track is plotted, Sabrina waits for a typed response. Anything other than Q or q (including just a <CR>) will plot the next track; Q will terminate the track plotting.

Only a single history is shown at a time (if Sabrina is taking care of backing store). The tracks are not written to the backing store bitmap and will disappear if the graphics window is obscured or otherwise damaged.

When Stepping through pruned tracks, occasionally multiple histories, some of which may be incomplete, will appear.

TRACK WIndow { Clip | Ignore | }

Use the spatial Window (WINDOW command) to CLIP the tracks or not. No argument tells about current state.

TRACK UPdate { N | File }

Refresh the plot after N fragments since the last refresh. A fragment is the portion of the track between 2 events.

The File setting causes the tracks to be written to a file and displayed all at once. Subsequent ZOOMs will read from the file, resulting in quicker drawing.