Toby sat at his desk, surrounded by stacks of research papers and empty coffee cups. He opened his e-mail and found the following message from his PI:

Toby –

Bad news — our collaborator was in an unfortunate accident, something to do with one of those stuffed animal crane machines... anyway, as you know he was supposed to present on our crop modeling work at PAG next week, but he must have been worried about getting scooped because all the notes for his presentation are in some kind of code. I'm sending along what we have. I'm sure you can figure out what the crop is in time.

– Prof S.

y = -0.17(x₁ - 2.3)² + Coef_days + 1.3·x₃ - 23.4