The Google Map API features use of the Chart API in a script called
MapIconMaker to make map-pin icons.  I think that when using a two-
letter text in a standard sized pin icon, the text is just a little
too big, and especially in the star-topped icon, it's hard to read. I
would like to tweak it to make it a little smaller and perhaps a bit
lower in the round part of the pin.

The MapIconMaker uses a URL that begins:

http://chart.apis.google.com/chart?cht=d&chdp=mapsapi

followed by a string of parameters that is very complex and
_extremely_long.  I expect it is not just generating the image, but
placing it in the right location on the map.  My questions are:

* Is there some documentation of cht=d somewhere?

* If not, is there a parameter I can use to tweak text size?

Thanks.
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