Ambient noise station-correlation spectra for USArray stations

M13A-TA secondary stations.

J11A-TA J12A-TA J13A-TA K10A-TA K12A-TA K13A-TA K14A-TA L12A-TA L13A-TA M09A-TA
M10A-TA M11A-TA M12A-TA N09A-TA N10A-TA N11A-TA N12A-TA N13A-TA O09A-TA O10A-TA
O11A-TA O12A-TA P10A-TA P11A-TA P12A-TA Q12A-TA
DUG-US HLID-US