The ColRelNegU structure specifies the zero-based column index of a column in a sheet offset information for this column index and a corresponding row index.
col (14 bits): A signed integer that specifies the zero-based column index or offset of a column in the sheet that contains this structure. MUST be greater than or equal to -255 be less than or equal to 255.
A - colRelative (1 bit): A bit that specifies whether col is an offset.
B - rowRelative (1 bit): bit that specifies whether a row index corresponding to col in the structure containing this structure is an offset.