well, you're right if in your dataset Y axis is composed by little numbers as 1-3-2-4-5-6. if we got in Y axis number like 100-200-300, output jpeg is unreadable because of this option 'integer_ticks_only' => 1,. many thanks for you help

In reply to Re^4: Draw chart by lorenzob
in thread Draw chart by lorenzob

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