There is literally no units on the graph at all. You can’t say it’s in joules because that’s not that the manga says. You can’t say it’s in megatons because that’s not what the manga says. You’re trying to add something that literally isn’t there.
The graph is unquantifiable. The increases are unquantifiable. We aren’t giving Saitama an over 9x increase based on that.
I'll try to refute this point using mathematical proofs. Let's say Saitama's power is graphed as being 1 unknown unit on the Y axis, and then he's shown on the next plotted point, he's 2 units up the Y axis. That means from point 1 to point 2, he has grown 2 times in power,
regardless of the units.
Let's use a very simple mathematical proof to show this. Say 1 point on the graph is R in value. That means each point is R times how many units up from the origin they are. We'll start small and work our way up to prove this equation is true.
Starting simple, R = 2. No units. Well if we're 1 unit up on the Y axis, the equation is Y1 = R x 1. 2 x 1 = 2, duh, so that means we have a value of 2.
Moving on if R = 2, and we're 2 units up on the Y axis, that would mean our equation is Y1 = 2 x 2 = 4. Seems internally consistent
Now if we want to find the multiplier required to get from our 1st Y value to our 2nd Y value, we just divde the larger number by the smaller one, getting a x2 multiplier.
Now for a larger scale example:
Let's say R = 76954768457654876 we're 2 units up. Well let's just plug it in to our equation, Y1 = R x 2, which equals 1.5390954e+17.
Then, on the next point, we're 4 units up. So Y2 = R x 4, which gets us 3.0781907e+17.
Now how many times more powerful did the person get between Y1 and Y2? They grew twice as powerful. Why does this matter? In the OPM graph we never get how much 1 equals, so why does this long response even exist?
Because mathematical reasoning exists. Let me phrase this like a math question. Person X one starts 5 units up on the Y axis. He then climbs another five units. Without knowing R, how many times more powerful is Person X at Y2 when compared to Y1?
Well even without knowing R, making our equation Y1 = R x 5 and Y2 = R x 10, we still know that the value of R is a constant on a graph. So we just divide the two numbers we have by each other to learn that they grew twice as powerful. The units are abritrary, it doesn't even matter if they use their own made up system called Terragiggachadchucknorris Scooby Doos, it is still showing his power doubled.