The offset is distance between the top of the window and the lowest point of the eaves, so it may be a positive or negative number.
The 1st example shows positive offsets = the shading device is above the glazing.
The 2nd example shows a negative offset = the shading device overlaps the glazing.
Please Note: the only way to enter a negative number is to input the number first and then back space to enter the minus "-".
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