I want to make an arc 8 foot long and 2" 'deep' So the code for this looks like

CG, ,19.844759,0.020793,574.745911,-47.979000,T,-1

Now what I would like to understand more is the code itself.

In this code I see
diameter is blank
Xendpoint is 19.844759
Yendpoint is 0.020793
*X-center-offset(I) is 574.745911
*Y-center-offset(J) is -47.979000
True T (cut on the line)
direction? -1 (Anticlockwise?)

I am assuming that the center offsets are the virtual center of a giant circle containing this arc on its circumference.

Since this arc bows left the -47 is confusing. How do I use the info to create my own arc?

If say I wanted an 8' arc with a depth of 3 inches?

Thanks in advance,