january. that's on the left-hand side. are those the same people the next month? >> no. so, the people who got vaccinated in january -- people who finished their vaccination in january are on the left. people who finished their vaccination in february, the next one. and then, march. so what you would expect is that it would be gradually going up, right? the closer -- the -- the -- the more -- the further you are from your vaccination, you should have less protection. so january should be the lowest. >> right. >> and then, it should be going up after that. but instead, what you see is that march is actually the highest. and then, april goes down. that's a little confusing. and those -- and those dark lines in the middle. that's what's called a confidence interval, anderson. i am nerding out a little bit here. but that gives you an idea of just how much variation there could be within those bar graphs. and if you look at those black line, you see that, you know, you could sort of -- you could sort of make the case that they're pretty similar across the board. and that -- that's the question. is the protection really going down? or not? that's -- that's -- that's the