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There are two parameters that can be used to alter the size of the LED
digits.
- The size (in pixels) of each "led diode"
- The distance, specified as fractions of the "led diode" size
between each "led diode"
These two parameters are given in the constructor which has the
signature DigitalLED74::DigitalLED74($aRadius=2,$aMargin=0.6)
as can be seen from the above signature the default size is 2 pixels in
size and a fraction of 0.6 as the distance.
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