In your first chart looks good. With your second chart you changed the
axis range but you also need to tell the API to auto-scale your data
to match. Modify your CHDS parameter so it reads 50,131.

When working with grid lines you need to consider the chart area as a
100x100 grid and specify values accordingly. In addition, you're
having the API draw the y-axis labels (chxr=...|1,0,131,20|...) and
it's going to be difficult lining things up. If, for example, changed
your CHDS and CHXR values to range from 0 to 150 (step size of 25) you
can use CHG=25,16.67,6,6 with the logic being... 0--150 with step size
of 25 and a grid line on each vertical label means we need 6 grid
lines --> 100/6 = 16.67

Hopefully that math works out - Good luck,
K
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