The graph shows time in days from 0 to 900 and mean squared error from about 0.01 to 100 degree celsius squared. Curves labelled G A T, Kriging, G P, and A N N show different trends. Kriging increases steadily to about 30, G A T rises to around 2 then gradually increases, G P peaks near 6 then declines to near 1, and A N N fluctuates between about 0.1 and 2.
Comparison of the mean squared errors for the partial failure of the distributed sensor