A vector or a GLmultiVector object depending on the type of 'phiMatrix' entered.
If 'phiMatrix' is a GLmultiMatrix, an array of vectors (GLmultiVector), one for each depth, is returned.
Array of size ('depthMax'-'depthMin'), vectors of size 'length(probs)'.
If 'phiMatrix' is a matrix, a vector of size 'length(probs)' is returned.