I am solving a free vibration problem of a composite plate. The results are reported for the fundamental mode as:

Out of plane deformation for mode 1.

Rotation (linearized) about Y for mode 1.

Now, is it correct that the rotation is so small? The distance from the edge to the center of the plate is 5 units. So, following a straight line at the slope of 1.881 we get to a rise of 1.881 * 5 = 9.4 at the center of the plate. This is less than half of the reported deflection at the center. How is this possible?