Got it, Thank you very much KeithB, You explained in details, thank
you very much

On Aug 11, 9:52 pm, KeithB <[email protected]> wrote:
> You're using text encoding which means the chart area ranges from 0 to
> 100 in both directions. Your x-axis labels range from 1 to 31 and your
> y-axis labels range from 100 to 2000.
>
> Your first dataset has y values that range from 1200-1300, but you
> want to display those values on your 100 - 2000 chart. By using
> 1200-1300 within the chds parameter you're telling the API to scale
> the data automatically so that a 1200 point is on the exact bottom and
> 1300 is at the exact top.
>
> Therefore, your CHDS parameter should be:
> chds=1,31,100,2000,1,31,100,2000
>
> Cheers,
> K
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