Table 2.
Used stem weight equations on D alone, and D and H together.

Equations (variable D only) Equations (variables D and H)
W = a+bD2 (1) W = bD2H (5)
W = bD+cD2 (2) W = a+bD2H (6)
W = a+bD+cD2 (3) W = a(D2H)b (7)
W = aDb (4) W = aDbHc (8)