ThreeDify is pleased to announce the availability of new XLCurvFit and XLSurfFit releases. The new releases add a powerful feature that allows user-defined 2D and 3D functions to be fitted to any specified 2D and 3D Excel data sets, an enhancement our users have been asking for. Combined with the existing powerful auto-equation fitting capability, this gap filling feature makes XLCurvFit and XLSurfFit a one-stop Excel add-in suite for Excel users who need a quick and reliable curve and/or surface fitting tool right within Microsoft Excel.