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I think below is correct
Look at the atan function:
SYNTAX atan( Y DATA ARRAY, X DATA ARRAY )
FUNCTION Returns the arc tangent of Y/X. The value is returned in degrees
from 0 to 359.9. The degrees are returned increasing counter clockwise with
0 degrees at the 3 position of the clock, 90 degrees at the 12 position etc.
EXAMPLE The formula "atan( 10, 0 )" returns 90.
You are feeding the funciton the slope of the line (rise/run), where Y Data
array is rise and X data array is run.
This will be different from your image which seems to show a horizontal line
with a 90 degree angle.
It also appears that you are returning angles without regard to direction of
slope.
Hope the above helps.
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