How to get equations of plots from this image ?

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RuiQi
RuiQi el 16 de En. de 2017
Comentada: KSSV el 16 de En. de 2017
How to get equation of each plot from this image ? I want to replot it. Any app that i can use ?
I used the app provided by KSSV but I got a curve that isnt as smooth as the original one. Can anyone suggest how I can smoothen the curve ? I tried fitcurve but it doesn't look right at all

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KSSV
KSSV el 16 de En. de 2017
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RuiQi
RuiQi el 16 de En. de 2017
Sweet ! Do you know how I can smoothen the curve ? I took 11 values of one plot and when I plotted it (image in original post) I got something that doesn't look smooth.
KSSV
KSSV el 16 de En. de 2017
You take more number points....you can smooth it using spline

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