Hi Bavragor

The default interpolation method is linear interpolation between points (x_i,y_i) - and extrapolation if the value of x is beyond the interval. All this applies to all keywords that may vary, not just the H-B curve.

I would personally use the following syntax with "End" that frees from the agony of having to know the size.

Code: Select all

```
H-B Curve = Variable "dummy"
Real
include HB
End
```

Linear interpolation is not always optimal. For this purpose "cubic" spline interpolation may be requested. It ensures continuity of derivaties as well.

Code: Select all

```
H-B Curve = Variable "dummy"
Real Cubic
include HB
End
```

For poor data the spline could at times give negative dH/dB. For this purpose there the user may request the fitting to be monotonic:

Code: Select all

```
H-B Curve = Variable "dummy"
Real Cubic Monotone
include HB
End
```

To my knowledge this is the choice for most production runs involving H-B curves.

-Peter