Full analysis: prolate and oblate -- December 19, 2010 - 06:26

Hello,

I have performed a "full_analysis" run, and the Chi2 values for
prolate and oblate models were reported to be identical. I have
checked the contents of the /prolate/round_**/opt, and the results
file appears to contain the data for the oblate model:

================
<diff_tensor desc="Diffusion tensor" type="spheroid">
<Da ieee_754_byte_array="[144, 224, 168, 43, 17, 72, 82, 193]">
                -4792388.6821824461
            </Da>
<fixed>
                False
            </fixed>
<phi ieee_754_byte_array="[127, 197, 226, 164, 9, 205, 0, 64]">
                2.1001160508828316
            </phi>
<spheroid_type>
                'oblate'
            </spheroid_type>
<theta ieee_754_byte_array="[157, 42, 47, 69, 3, 109, 252, 63]">
                1.7766144468793421
            </theta>
<tm ieee_754_byte_array="[131, 104, 243, 90, 176, 172, 60, 62]">
                6.6763176508168525e-09
</tm>
</diff_tensor>
================

So, does it mean that the system is converging to the oblate model in
the prolate pipe? I thought the Da sign is constrained during the
search.

Thank you,
Vitaly