One section of a ColorFlow-created characterization chart. It is a page in a PDF file that will be printed as one complete surface (front or back) on a printing device. If the printable area of the print device is too small to contain a complete characterization chart, then the chart is sectioned into multiple forms which must be printed in separate print runs. ColorFlow can generate charts for measuring the response of double-sided printing devices. In this case, front and back forms are generated, with the color patches on back forms being the mirror image of those on the front forms.