Analysis Strategy

for the rest of the lines in the spectrum

Given the computational efficiency inherent in avoiding doing two integrals numerically, we will take beta=1 and for isotropic porosity, use the Rosseland bridging law. For anisotropic porosity, we have no choice but to do the double numerical integral (actually, we could use the "step" model, but we won't). However, for consistency sake, we will also take beta=1 and use the Rosseland bridging law in this case too.

So, for each line we will do the following:

Then, to assess systematics - of a sort - we'll refit some of the lines using:

These two separate exercises will give us a sense of how much model assumptions affect the confidence limits on the important derived parameters.

Finally, we will explore the effects of the assumed terminal velocity on our results (especially the derived taustar values in the non-porous cases). We'll do this by refitting some (all?) of the lines in the non-porous case. We will selectively examine the two porous cases for a handful of lines too. We can bracket the adopted 2250 km/s standard terminal velocity assumption with 2200 km/s and 2350 km/s (Haser's dissertation).


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last modified: 27 April 2008