For each given VCE port index k, this parameter is a one-dimensional array of complex values in linear scale for upstream FEXT coupling coefficients Xlinus(f) originating from the loop connected to the VCE port k into the loop for which Xlinus(f) is being reported. Each array entry represents the Xlinus(f = n*Df) value for a particular subcarrier index n. The Xlinus(f = n*Df) value is represented as ((XLINSCus/2^15) * ((a(n) + j*b(n))/2^15)), where a(n) and b(n) are signed integers in the (-2^15 + 1) to (+2^15 - 1) range. A special value indicates that no measurement could be done from line k into this line for subcarrier n. Another special value indicates that there is no phase information and the magnitude of Xlinus (f = n*Df) is ((XLINSCus/2^15) * (a(n)/2^15)).