Hmm... This is not graph stuff, it's plain money management.
Here's an example. If I have $100 in my account, then my max stop loss for 1 position is $1 (1%). Suppose I develop my account to more than 25 positions, then I set my maximum risk for the whole account to $25 (25% of $100). It means that, for instance, if I have 50 positions opened on a $100 account the max risk on each position will be $0.50 (25% of 100 / 50).
The more positions I have opened, the more tight my stops become, and when they start systematically getting triggered I know that my risk is too high for the market volatility and that I have too many positions opened.
These numbers are arbitrary, they're not magic. Your % of risk is your accelerator pedal. If you're in the last month of a competition like the world cup, you can even floor it at 100% (make or break).
Of course, if you're managing a behemoth account with money that isn't yours (like a hedge fund), you don't want that risk. 2% or 3% is all that you'll accept each year, for a max gain of what? 20%? 30% in the best years?