How can I get more detail in pdf file that created by core plot?

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I use core plot to create ECG graph. I can see the detail in the ECG graph in my app, but I can't see the detail in the pdf file.

How can I get more detail in pdf file that like app screenshot?

Thanks, Midas

PDF file screenshot

App screenshot

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The image is exported at the same size as the layer. Set the size of the layer bounds to a larger size before calling -dataForPDFRepresentationOfLayer or -imageOfLayer.