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Expected average gap between imputed trajectories and the true unobserved trajectory. The length of the interval of missingness, 
, ranges from 
to 
by increments of 
. For each value of 
, the average over 
simulations are used to estimate the average squared gap for the simulation approach. While for small 
and small 
LI can be a better approximation to the true trajectory, asymptotically the simulation approach is better for any amount of curvature.
