This example shows how to build surface by approximating areas with constant real numbers and how to set additional condition (mean value) on surface in area. In this example 6 different areas were used. This example looks like area.tcl example, but one area (area6) with mean condition was added.
Pic 1. Surface with mean value = 30, built from areas
This result was obtained with
surfit: gridding and contouring software.