Hi Keith, thanks a lot ! Changing CHDS solved the problem.
For various time serie operations, I need a single Y-axis.
Example:
http://chart.apis.google.com/chart?&cht=lc&chdlp=b&chf=bg,s,FFFFFF&chma=50,50,20,30|80,20&chm=A107.2,008000,0,3,12,,e::-12|A100.7,008000,0,7,12,,e::-12|A88.9,008000,0,11,12,,e::-12|A105.7,0000FF,1,3,12,,e::-12|A97.9,0000FF,1,7,12,,e::-12|A91.0,0000FF,1,11,12,,e::-12&chs=700x300&chtt=Total+World+Trade+by+EU27+with++in+Quarters+-+indexed+value+(2007/Q1+=+100%)|&chts=0000FF,14&chd=t:100,101.2,100.0,107.2,107.1,110.7,107.9,100.7,83.8,81.0,83.1,88.9|100,101.3,99.3,105.7,106.1,109.6,105.2,97.9,83.0,82.9,84.9,91.0&chds=81.0,110.7&chdl=Import|Export&chco=008000,0000FF&chxt=x,x,y&chxs=0,A9A9A9,12,0,lt|1,A9A9A9,12,0,t|2N*sz0*%,A9A9A9&chxl=0:|q1|q2|q3|q4|q1|q2|q3|q4|q1|q2|q3|q4|1:|2007||||2008||||2009|||&chxr=2,81.0,110.7&chg=-1,-1,1,2&chls=2,6,3|2

Thanks again and best regards


On Apr 13, 2:17 pm, KeithB <[email protected]> wrote:
> Sorry, I was not very clear in my first message...
>
> Change your CHDS parameter to read "chds=93,123" instead of
> "chds=93,103,100,123"
>
> That will tell the API to treat 93 as the bottom of the chart and 123
> as the top of the chart **for both data series**. Here's a link with
> the CHDS parameter change:http://tinyurl.com/y4yehcu
>
> You are only using a single y-axis at the moment (93-123) so there is
> no need to scale your two data series independently. Not to confuse
> things, but if you wanted the left y-axis to display 93-103 while the
> right side of the chart displayed 100-123 then your original CHDS
> parameter with two ranges would be perfect -- you'd just have to
> modify your CHXT and CHXR params.
>
> Cheers,
> Keith

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