I don't understand how to get the temperature from this graph?

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The discussion centers on extracting electron temperature from a semi-logarithmic graph depicting current against voltage in plasma control experiments. The method involves selecting two points on the graph, specifically a current ratio of 270 µA to 100 µA, which corresponds to a natural logarithm value of e (approximately 2.7). This approach allows for the calculation of temperature in electron volts (eV). The participants seek clarification on the methodology for interpreting the graph accurately.

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This is an experiment on plasma control. A graph of current against voltage is drawn on a semi log paper. From this graph, we can get the electron temperature (measured in eV). The method is shown in this picture, but I don't understand it at all. Can someone please explain it to me?
 

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Not my field but looks like they picked two points separated by a factor of 270uA/100uA = 2.7 = e on the vertical scale for convenience... ln(e)=1

Something like that anyway.
 
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