Subsidence profile function, s(x), along the lateral cross-section over a flat longwall panel is given as

$s(x) = 0.8 \left[ 0.996 - \tanh \left( \frac{8.3x}{D} \right) \right], \, \text{m}$

where $x$ = distance (m) from the inflection point and $D$ = depth (m) of the seam. Considering that the inflection point lies vertically above the edge of the panel, the angle of draw in degrees for a depth of 250 m is ______.