Can you give us any hints? I tried findobj() but can't make progress!
You are on the right track with findobj(). The trick is what the call to "legend" does to the objects that make the solution very simple.
Find matching string from a list of strings
What is the distance from point P(x,y) to the line Ax + By + C = 0?
Getting the row and column location from a matrix
Multiply 2 numbers
Big numbers, least significant digits
Generate a NaN...on purpose
Big numbers, repeated least significant digits
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