# Important definitions in Track editing

Sample vs. body point

A sample is the set of coordinates found at any sampling time. This means that:

▪If your experiment is set to Only center-point detection, a sample is the subject's center point (one pair of X, Y coordinates).

▪If your experiment is set to Center-point, nose-point and tail-base detection, a sample includes the center-point, nose-point and tail-base point (three pairs of X,Y coordinates).

Within a sample, one or more points can be missing. Missing points are shown in a different color.

See also

▪Customize the missing sample points

Sample List

The Sample List is the list of coordinates of the subject’s body points and surface area, for each sample time. It is the actual raw data used in all the subsequent analysis functions (from Track Smoothing to Results).

To access the Sample List window, choose Acquisition > Edit Tracks. If the Sample List is not shown, choose Show/Hide > Sample List.

important When you select samples in the Sample List, selected samples are highlighted in green, while the sample time that corresponds to the current video image is the one shown in blue in the Time column. These two selections are independent of each other, meaning that the video image may show a sample time that is not within the range selected. For example:

Save edits

You can save a copy of the track that includes the last edits. If you make changes after clicking Save, you can always go back to that copy if you are not satisfied with those changes.

See also

▪Saving the track edits