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Print size is 3:4 ratio
'h' - toggle high resolution
's' - save PNG file
The high resolution image outputs at 8,192 x 8,192 pixels.
Print 27.31" x 36.41" at 300dpi Print 69.34cm x 92.47cm at 300dpi
Add ?forceWidth=xxxx
where xxxx is the pixels size you want. For example to print at 100cm high, the width would need to be 100cm. 100cm in inches is 39.37" at 300dpi = 11,811 pixels width. So using ?forceWidth=11811
and downloading will give you an PNG large enough to be safely printed at 1 meter height.