Since O is the centroid of ASPT, it divides each median in the ratio 2:1. Therefore, OS = 2/3 * 2.6 = 1.7.
The area of triangle SPT is (1/2) * 2.6 * 2.6 = 3.36.
The area of triangle MPO is (1/2) * 1.7 * 2.6 = 2.22.
The area of triangle OSP is (1/2) * 1.7 * 1.7 = 1.54.
The area of triangle OPT is (3.36 - 2.22 - 1.54) = 0.58.
Therefore, V = 3.36 + 2.22 + 1.54 + 0.58 = 7.6.