Hello,

I'm confused about Map charts.

So far, I'm getting a decent image with this call:
http://chart.apis.google.com/chart?cht=map:fixed=-55,0,80,0&chm=fVenezuela+%2843%29,000000,0,0,12|fUSA+%283%29,000000,0,1,12&chtt=Lecturas
por Paises&chd=t:
93,6&chs=650x450&chf=bg,s,eeeeee&chco=cccccc,FFCCFF,FF0000&chma=0,0,0,0&chld=VE|
US

However, I would like to get the map to a more "standard" layout...
"centered" if that's really possible: Having America to the far west
and Australia to the far east.

I found that there is an undocumented parameters called chtm. And that
it can receive "nice" values such as world, asia, etc.

However, when I try to adapt my call to this new parameter, I get an
error: Unsupported Map Request.
http://chart.apis.google.com/chart?cht=t&chtm=world&chm=fVenezuela+%2843%29,000000,0,0,12|fUSA+%283%29,000000,0,1,12&chtt=Lecturas
por Paises&chd=t:
93,6&chs=650x450&chf=bg,s,eeeeee&chco=cccccc,FFCCFF,FF0000&chma=0,0,0,0&chld=VE|
US

Where can I found the documentation of this param and/or chart type?

Many many thanks in advance,
Will

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