There is a bit more in the work sheet [Nsectors, inner radius].
More can be done... for instance: if the XY Lissajous would be
a closed isoline around a mountain, it would easy to adapt this
basic construction ... adjust the great circle, inner circle.
You can add/size the inner circles.
Jean
2D Radial Grid.sm (24 КиБ) скачан 61 раз(а).