The default destination is HTML with DPI=96. The graphs themselves are saved in the Temp folder. If you want the graphs accessible at a higher resolution, you can turn on LISTING destination, and set Image_dpi=200 or 300. If you use PDF destination, you will get scalable output at 150 dpi, which can be increased. This output is scalable, so the graph in the PDF doc (especially the printed version) should look nice.
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