Superposition of all tidal spectra or all stations
A
b
e
r
d
e
e
n
D
o
v
e
r
I
m
m
i
n
g
h
a
m
M
i
l
f
o
r
d
H
a
v
e
n
N
o
r
t
h
S
h
i
e
l
d
s
S
h
e
e
r
n
e
s
s
