This is the Midpoints page.
The portion of the site which deals with charts is at a very rudimentary level.
What you can do, you control through the url.
This page responds to all the parameters in this USA/Howland Sample
No other point-names are currently used/recognized but you can change these
values to anything you want and this page will present your midpoints
example: specify mercury at 24can13rx as Mer=Can2413r for best accuracy
We can present from 2 to n points in this grid. Scroll down all the way to see some examples
There's probably a columns/rows missing in the last couple of grids. my bad. will be fixed soon.