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Lower bounds on 
. For the GMRF smoothing prior with 
for all 
and 
, we compare the lower bound on 
(red, dashed, see Equation 14) with the actual value of 
(cyan) at the robust design point of 
. We examine all integer 
values that are factors of 
, and find that qualitatively similar comparisons hold for different 
and 
settings. In general the lower bound (
) is a good approximation to 
.
