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The black curve is the evolution of the pressure difference 
due to the deflation process, saturating at a value 
. Firing of the trap door occurs at a time 
when 
reaches the buckling pressure 
. Fluctuations in 
entail fluctuations in 
which are bigger when 
is close to 
, explaining the scattered values of 
for “random” traps. If 
is bigger than 
, buckling is impossible and the trap is in a “waiting” state.
