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Fig. 4. (A) An image of a colony before anesthetization. (B) The same colony after
anesthetization with MgCl2. Single arrows indicate a lophophore
that has turned around after anesthetization; chimney height (H) is the
difference in height between the tallest part of the chimney and the shortest
part of the canopy (double arrows). These images were taken in side view with
the light sheet perpendicular to the colony. (C) Scatter plot of chimney
height before and after anesthetization (N=6). (D) Scatter plot of
the change in chimney height after replacing seawater with anesthetic (0.35
mol l1 MgCl2).