# Fe XVII 15.014 Angstroms

## Models with isotropic porosity

Note: Both MEG and HEG are being fit simultaneously

Same continuum fit as we used for the non-porous models: n=2, best-fit norm=1.71e-3.

Note that the opacity bridging law used for these isoporosity fits is *Rosseland*.

This best-fit model is nearly identical to the non-porous best-fit model, as a value of *h*_{inf}=0.00 is preferred even when a non-zero porosity length is allowed.

Here are the 68%, 90%, and 95% joint confidence limits on *h*_{inf} and taustar. The asterisk represents the best-fit model, shown as the red histograms on the above two plots.

And here are the joint constraints on taustar and *u*_{o}:

Here is the best-fit isoporous model with taustar=8 fixed. This represents the value implied by the literature mass-loss rate. It can be seen in the first of the two confidence limit contour plots above that this value of taustar lies outside of the 95% confidence range.

Note that the value of the fit statistic, C=295.74, is ~15 higher than the best-fit value, which implies that the best-fit model (with taustar free) is preferred at >99.9% confidence. The porous model with high optical depth leads to a profile with a bulge on the far blue wing and also one near line center. However, this model with taustar=8 and non-zero *h*_{inf} cannot be rejected outright as a bad fit. It does, however, require a terminal porosity length of at least 2.51 (even at the 90% confidence level on the taustar=8 model).

Next, we fit an anisotropic porosity model to the data.

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*last modified*: 29 April 2008