First, we are going to make a grid of (x,y) values.

• Open up an Excel spreadsheet.
• Enter in cell B1: -0.1.
• Enter in cell C1 the formula: =B1+0.005 (as shown below).
• Copy the formula in cell C1 over into the adjacent cells in the first row up to and including cell AP (which should have a value 0.1).

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