Alexander Knysh

It looks like you have an additional polynomial _bt **x** + a_ in the interpolation function https://arxiv.org/pdf/1605.00998.pdf (equation 4) while scipy uses only the first "sum-lambda-phi" term by default: https://github.com/scipy/scipy/blob/adc4f4f7bab120ccfab9383aba272954a0a12fb0/scipy/interpolate/rbf.py#L290...