applescript parameters for ellipse

The following command makes an ellipse:

make new path at beginning of document id 2 with properties {segments:{arc, {0.95, 0.0, 0.0, 1.0, 112.126693725586, 0.0}, {400, 324.0}, 110.5, 0.0, 6.283185482025, true, close path}}

{400, 324} appears to coordinates for a reference point, but what part of the ellipse is it?
6.283185482025 is 2*pi, the angle subtended by the arc

What do these parameters do?

Is there documentation for this?


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