For each point of a Pen, a value is linked, which can be null, and a quality, which can be Good, Bad, or Uncertain.

Points with null values or with a Bad or Uncertain quality generate a discontinuity on a Pen's line drawing.

Use the options of the Search Mode to view a point's quality and whether this point contains null values or not. If no quality is indicated on the search, this point's quality is Good.

To configure the way to view Pens with Bad quality, right-click a Pen and select the Edit option. On the window that opens, select one of the items on the Type option on the Connection options group. The Don't connect bad points item does not connect points with bad quality, the Connect until bad item connects points until quality turns bad (default), the Ignore bad item ignores points with bad quality, and the Connect all points connects all points, regardless of their quality.