(Optional) Modify default values

The radio button Default values is initially set to ON, denoting the use of the default parameters for the integration rule. If you deactivate it you can set the Rule and the Order. The former offers just the Gauss Rule (no options yet).
Both buttons to the right of Order identified with the "<" and ">" will increase or decrease the order of the integration rule. Valid values are 1, 2, 5 and 7. For example, the rule of order 5 will integrate exactly (no error) any surface described by a two dimensional polynomial of degree 5. Conversely, it integrates exactly the Taylor expansion of any two dimensional function up to the fifth degree.
By default, the rule of order 1 is selected. This will evaluate exactly the integral of function which are planar within each triangle.

Fig. 58

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