Polynomial fits not working in Colorimeterv05

@WillDickson ... we had a discussion about this in the "Additional tests for colorimeter..." thread and I think I was able to get polynomial fits to work in MayJune of 2017 after you packaged v05. But now @maddiehankard and our group at St Thomas have created another pH curve that we are playing with and v05 will only let us use a linear fit (not even a second or third order polynomial... and we need 4th order). Our xy data are below.
# 20180411 Hankard, Wolf, University of St.Thomas # Colorimeter Data # LED white #  # pH  Absorbance 4.74 0.26 5.45 0.21 5.69 0.22 6.36 0.25 7.00 0.34 7.43 0.44 8.16 0.55 9.17 0.62

@fisherba Thanks  I will have look this weekend.

@WillDickson Oh, silly us! The curve makes a ushape, so we needed to drop the pH 4.74 value. Now the polynomial fitting works.

Yes, I think that would be the issue. I'm glad you were able to get everything working.