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hi team, i was using the "follow shift changes" function of ccpnmr and discovered a bug. when i chose the fiiting function: A((B+4x-sqrt((B+4x)^2-(4x)^2))/4x-c), the Kd fitted was all negative values. i thus changes to another function A(B+4x-sqrt((B+x)^2-4x)) which does not fit very well but gives sensible Kd values. When i was looking at the <fit graph> window for each spin system, i manually changed the fitting function from the drop list in the <fit graph> window itself. But instead of reporting an insensible negative Kd value, it showed a reasonable value. please look into this matter -- Warm Regards, Lua