It appears that I am unable to run 90% confidence step (=4.61) with IDL and draw contours.
I get an error 
CONTOUR: Contour levels must be in increasing order.
% Execution halted at: CONFIDENCE_WINDPROF_LARGE_SHOW3  798.
[drawing surfaces appears OK..]

However, plotting 68% (=2.71) seems fine although even in q vs. Tau_* plot,
our range for q is too small...

1. For 2.71 run with q vs tau_*, I get:
    -0.680000
     0.420000
    -0.680000
     0.420000

2. For 2.71 run with q  vs. umax, I get:
    -0.680000
     0.763333
    -0.680000
     0.763333

3. For 2.71 run with tau_* vs umax, I get:
     0.420000
     0.763333
     0.420000
     0.763333