I have already fitted many adsorption kinetic and isotherm models linear and nonlinear fitting using Orifginpro, MS Excel, and Excel Solver and posted on my YouTube channel: youtube.com/@aminulchem. However, I could not fit the nonlinear Dubinin-Radushkevich (D-R) isotherm model yet. Could you please help me fit the nonlinear Dubinin-Radushkevich (D-R) isotherm model using Originpro?