### New Extinction Curve

*x*, which is roughly one-to-one related with

*R(V)*. A python implementation of this curve is available here:

### Example code

```
import extcurve_s16
ec = extcurve_s16.extcurve(0.) # mean extinction curve
lam = numpy.linspace(5000, 45000., 1000.) # angstroms
plot(lam, ec(lam))
xlabel('$\lambda$ (A)')
ylabel('$A(\lambda)/A(5420 A)$')
```

Varying *R(V)*can be obtained by calling extcurve() with different arguments. For example,

ec = extcurve_s16.extcurve(0.04)roughly corresponds to

*R(V)*= 3.6.