
The files tritest2.1, tritest2.2 and tritest2.3 may be used
as test data for bandnois, twocrosp, tricrosp and sleeman. 
They contain short-period ground noise recorded at ASL with 
three GS-13 seismometers and a high-resolution Quanterra Q330 
digitizer. Nominal system parameters are: 

0.03 microvolts per count
1 Hz corner frequency
0.707 of critical damping
2000 Vs/m generator constant

The original data files have nearly two million samples 
but here we have truncated them to speed up the download. 
Note that cross-spectral analyses do require large data
sets, and the truncated ones may not give significant results.
