Need one more equation in Martian

Have found all equations except one in the Martian. Help???

I don't remember where they all are (and don't know which ones you've found). But some of them are very, very small. The ones that were the hardest for me to find were the little one on the fence, on the edge of the platform, on the mail box, and on the space ship, and on the tree. (I think, those were the spots.)

The way I did it, was to do a screen print of the scene and paste it in MS-Word. That way I could blow it up really big and search for them.