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Fig. 3. (A) Coordinate systems of the Z-stack (xz,
yz, zz) in blue and of the fish
(x, y, z) in red. (B) Schematic representation of a
portion of a muscle fibre (thick red line) that extends between two parallel
optical sections (shown pink) in the (x, y, z)
system at a mutual distance
z. The azimuth and elevation
angles
and β and the projection of the fibre on the horizontal
plane
are indicated, as well as the
differences between begin and end points in the x- and
y-directions
x and
y. See main text
for further explanation.