Figure AB1.
Panel A shows a line graph with the y-axis ranging from 0 to 4 and the x-axis labeled time, milliseconds ranging from 0 to 2000. The graph displays fluctuating data points with several peaks and troughs. Panel B shows a black-and-white image of the same data as a waveform, with vertical lines representing peaks and troughs. Panel C shows another line graph with the y-axis ranging from 0 to 200 and the x-axis labeled time, milliseconds ranging from 0 to 2000. This graph also displays fluctuating data points with several peaks and troughs, corresponding to the data in Panel A.
Example of the digitization process. (A) Source image, in PNG format. (B) TIFF formatted by ImageJ. (C) The digitized variable “yt,” output of program below.