Average opacities measured in 2007. Given are the receiver name, frequency, average
tau, standard deviation, and number of observations.

RX      freq     <tau>     sx       n
11cm    2.64     0.017    0.002     3
6cm     4.85     0.018    0.002    10
3.6cm   8.35     0.019    0.001     5
2.8cm  10.45     0.020    0.002    18
2.0cm  14.60     0.024    0.004     4
1.3cm  23.05     0.054    0.036     3
0.9cm  32.00     0.034    0.012     5
0.7cm  43.00     0.050    0.010     3