The axes show the locus of the closed-loop poles for the current model and compensator. The various features include :

  1. The model poles and zeros (blue X's and O's, respectively)
  2. Compensator poles and zeros (red X's and O's, respectively)
  3. Closed-loop pole locations for the current compensator gain (red squares)
  4. The locus of the closed-loop poles (blue lines)
You can interact with this diagram using the various functions available from the Root Locus Toolbar at the top left of the axes.

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