Boltek Lightning/2000 - Manual (Page 180)

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The Counters tab of the Screen Captures dialog contains
options for saving images of the Rates and Totals windows to
files.
Rates
Enabled
This box must be checked for the Rates window image
capture to be performed.
Filename for .png image capture
The name of the file to receive the PNG image of the Rates
window. The advantage of the PNG format is that it is a
lossless format and generally results in a smaller file size than
a JPEG.