The variation of reaction Gibbs energy with fraction of fructose-6-phosphate (F6P) in an aqueous solution of glucose-6-phosphate (G6P) is given by

Where f is the fraction of F6P, is the standard Gibbs energy of the reaction (kJ mol^-1), T is temperature (K), and R is the gas constant (kJ K^-1 mol^-1).

To graph the fraction of F6P enter the parameters (i.e., , T) and hit New Plot. Up to 5 plots can be displayed at one time. The Clear button will remove all plots. To see the parameters for each plot hit the Legend on/off button. The Redraw button will refresh the graph. This is useful when the function domain (i.e., f ) has been changed. To see the value of each plot at a given point, move your cursor to the desired location then click and hold.