I have a set of data (x and y coordinates) from excel (see top of attached file), and when excel didn't want to give me the function for the data, I had to use a website to get a working onw. I am now trying to work my way from the data to the function in Mathcad 15, but I cannot get expfit to work. The guess values is where it goes wrong (probably just confusing me).
I have the working function and coefficients at the bottom of the attached file, everything else is trial and error. Can somebody help getting those coefficients from expfit?