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Once you level the photo, it is 308 pixels from one side to the other. It is 106 pixels from the left side to the red tape line. So the red tape line is the length of that wall * 106 / 308 from the left corner. I can't help you with the measurement from the far side to the pads. Could you tap the floor with a hammer, and listen for a change in tone when you hit the pads?
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