"Other Index: <nnn>" - index of other group for following operations
"Multiply" - multiplication of like components this with other group : (x1*x2, y1*y2, z1*z2)
"Divide" - division of like components this with other group : (x1/x2, y1/y2, z1/z2)
"Add" - sum of like components this with other group : (x1+x2, y1+y2, z1+z2)
"Subtract" - calculates azimuth and dip of particle motion (3-comp xyz groups)
"Dot Product" - vector dot product of active with other group
"Cross Product" - vector cross product of active with other group
"Sum All" - sum of like components of all other group into this groupd: (sum(x), sum(y), Sum(z))
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