Using Burger software, startup GravMag program located on the desktop. Program opens in Model window; Select $$Window$>$Section$.$ In View menu, select $$gravity$$ and uncheck $$induced magnetics.$$ To add points, click the $$New$$ button then click on lower panel of model window. Click on a value under the X coordinate. New point will be between that value and the next. Alternatively, click on the body and move the black squares to different shapes.

I. Make an octagon or similar sphere$-$like shape. Keep the default density. Position the body near the surface. From $$window$,$ select $$gravity data$$ to plot the curve. Calculate the depth using the $(1)/(2)$ width approximation. Does your $(1)/(2)$ width calculation agree with the model? Save your model and print the result.

II$.$ Now move the shape deeper and adjust to center the curve. In the $$cross section$$ window, you can drag you object to move deeper. Repeat the $(1)/(2)$ width calculation. Discuss and print your result.

III. Now change the density of the object while keeping the same depth and shape. Discuss and print your result.