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Have you checked the jpgraph support forums? I found this in there...
In X-Y graph, I have around 400 points.
If I plot these, xaxis labels look like a black belt.
How do I totally turn off xaxis labels?
Then, the poster answers his/her own post...
The following seems working.
I tried SetLabelFormat('') before, but it seems
I need a space.$graph->xaxis->SetLabelFormat(' ');