That sounds too low; 3 m$Hz would probably be right, but 3 µ$Hz is very little.
Yes, the year has pi * 1e7 seconds
1e5 / 3.14e7 ≈ 3e-3, milli, not micro
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Yes, the year has pi * 1e7 seconds
1e5 / 3.14e7 ≈ 3e-3, milli, not micro