Ambient noise station-correlation spectra for USArray stations

C03A-TA secondary stations.

A04A-TA A05A-TA A06A-TA B04A-TA B05A-TA B06A-TA C04A-TA C05A-TA D03A-TA D04A-TA
D05A-TA D06A-TA E03A-TA E04A-TA E05A-TA F03A-TA F04A-TA
NLWA-US