Thanks @hotNipi - It's a chart formatted for viewing on a phone and the 'default ui-chart' node lines are too thick - look as though they have been drown with a felt tip marker pen!
I assume they are at the line width used for charts being displayed on a monitor - not a phone.
I've adjusted your flow to draw them at 1px instead, and they look much better, crisp & clean, however the reason that I didn't want to 'go down this road' was the other problems which I've hit previously when using a template node and never resolved, and are also present in your flow.
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After a refresh or first connection the chart is always blank, and does not load previous datapoints, so no historical data.
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I have 2 feeds into the chart (different topic names), and the template version draws every datapoint regardless of the topic, on one line, instead of two.
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There appears to be no limit to the number of datapoints displayed in the chart. ie not limited by for example previous hour, or 1000 points.
Paul
