This plot presents a simulation example which demonstrates how RAIM works. Shown here are height deviations of a real-life RTK-fixed solution for a field static test with relatively high multipath levels. At epoch 494000 a time-linear bias was artificially added to the L1 phase measurements of GPS PRN 19. The blue curve corresponds to the solution with disabled RAIM: the bias causes significant distortion. The red curve shows the solution repaired by RAIM: height deviations always stay within nominal error margins and no impact of the bias can be noticed.