  For knots in S^3, the bi-graded hat version of knot Floer homology is defined
over Z; however, for a link L in S^3 with #|L|=l>1, there are 2^{l-1} bi-graded
hat versions of link Floer homology defined over Z, the multi-graded hat
version of link Floer homology is only defined over F_2 from holomorphic
considerations, and there is a multi-graded version of link Floer homology
defined over Z using grid diagrams. In this short note, we try to address this
issue, by extending the F_2-valued multi-graded link Floer homology theory to
2^{l-1} Z-valued theories. A grid diagram representing a link gives rise to a
chain complex over F_2, whose homology is related to the multi-graded hat
version of link Floer homology of that link over F_2. A sign refinement of the
chain complex exists, and for knots, we establish that the sign refinement does
indeed correspond to the sign assignment for the hat version of the knot Floer
homology. For links, we create 2^{l-1} sign assignments on the grid diagrams,
and show that they are related to the 2^{l-1} multi-graded hat versions of link
Floer homology over Z, and one of them corresponds to the existing sign
refinement of the grid chain complex.
