How do I get Google charts to scale an extended encoding graph?

Question

Over the course of my life, I cannot correctly display this graph with extended encoding.

If I change the axis range from 0 to 15, it looks correct, but if I change the axis from 9 to 15, the data is not displayed correctly.

This is obtained correctly:

<img src="http://chart.apis.google.com/chart?cht=lc&amp;chco=125292&amp;chm=B,cee1f5,0,0,0&amp;chls=2&amp;chs=408x237&amp;chxt=x,y&amp;chxl=0:|Jan|Feb|Mar|Apr|May|Jun|Jul&amp;chxr=1,0,15&amp;chd='+extendedEncode(Array(10,15,9,11,12,10,11),15)+'" />

But this is not true:

<img src="http://chart.apis.google.com/chart?cht=lc&amp;chco=125292&amp;chm=B,cee1f5,0,0,0&amp;chls=2&amp;chs=408x237&amp;chxt=x,y&amp;chxl=0:|Jan|Feb|Mar|Apr|May|Jun|Jul&amp;chxr=1,9,15&amp;chd='+extendedEncode(Array(10,15,9,11,12,10,11),15)+'" />    

I spent hours and hours trying to figure it out, and I feel like I'm missing something incredibly simple. I have to use extended encoding because of the range of numbers that my program will ultimately process, so switching to "Text format with custom scaling" is not an option.

Answer 1

: http://code.google.com/apis/chart/image/docs/gallery/line_charts.html#axis_range

: http://code.google.com/apis/chart/image/docs/data_formats.html#axis_scale

0-100 , . Google Chart URL- HTTP- GET.

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