How stable are the stablecoins on Terra?

As shown in graph 1 we can confirm that stablecoins on Terra are very stable. We can see in graph 2 how Luna exchange rate varies across the different stablecoins to stabilize them. In graph 3 taking UST as reference, we can see that this stablecoin has performed remarkably well in the last 6 months showing almost no fluctuations from peg except for some days.