regr scale smooth smoothness (0-100%), scale (0=auto,1=lin,2=log), regression (0=lin,1=quadr) A function following the tendency of the current data points. Guideline Not enough data for guideline. (cubic spline) A smooth function going through the current data points. Spline Bad x-value for the spline function. Not enough data for spline interpolation. n x0 m const n: integer or real value y = const + m*(x-x0)^n Power + A'*exp(-K'*(x-x0')^^22) y = const + A*exp(-K*(x-x0)^^22) Gauss x0' K' A' x0 K A const + A'/(1+K'*(x-x0')^^22 y = const + A/(1+K*(x-x0)^^22) Lorentz base const x0 K A base: base of logarithm y=A * log(K*(x-x0)) + const Log const t0 x0 A exponential y = A * exp(-(x-x0)/t0) + const Exp const x0 K A harmonic oscillation y = A * sin(K*(x-x0)) + const Sin Polynom deg: degree of polynom const + a1*x +...+ a^0*x^^3 f(x) = const + a1*x + a2*x^^22 f(x) = const + a1*x f(x) = const const deg