Supplementary Table S1:

Location and date
Peak frequency 
(Hz)
Minimum 
(Hz)
Maximum 
(Hz)
Eureka 07/18/02
79.4
74
84
Eureka 07/18/02
79.2
76
82
Kelso 07/30/02
102.1
92
106.5
Kelso 07/30/02
105.2
102.5
109.5
Big Dune 08/21/02
93.5
87
96.5
Dumont 08/21/02
89.7
82
94
Dumont 09/19/03
77.1
74
82
Dumont 07/23/04
90.2
83.5
93
Dumont 07/12/05
69.7
56.5
84.5
Dumont 09/08/05
78.6
75
84.5
Dumont 07/14/06
91.7
87
94
Dumont 08/22/06
83.3
80
88.5
Dumont 09/12/06
84.8
81
86.5
Table S1 | Error on the frequencies determined from the half-width used in the comparison 
between the frequency and average diameter in Fig. 3.