By the way, in the equation editor of the result object you can plot the radius of Mohr circle by entering (P1-P3)/2 and the center is found by typing (P1+P3)/2.
In a 3D analysis every stress point has 3 Mohr Circles with radius R and center C as follows:
[R, C]= [(P1-P2)/2, (P1+P2)/2]
[R, C]= [(P2-P3)/2, (P2+P3)/2]
[R, C]= [(P1-P3)/2, (P1+P3)/2]
Where the last one is the largest and encircles the other two.