23 June 2025 2:55:14.125 PM stiff_exact_test(): Fortran90 version Test stiff_exact(), which evaluates exact solutions of a stiff ODE. Parameters: lambda = 50.0000 t0 = 0.00000 y0 = 0.00000 tstop = 1.00000 plot4: data stored in "stiff_value_data1.txt", "stiff_value_data2.txt", stiff_value_data3.txt", stiff_value_data4.txt". plot4: plot commands stored in "stiff_value_commands.txt". stiff_euler_test(): Solve stiff ODE using the Euler method. Parameters: lambda = 50.0000 t0 = 0.00000 y0 = 0.00000 tstop = 1.00000 plot2: data stored in "stiff_euler_data1.txt" and "stiff_euler_data2.txt". plot2: plot commands stored in "stiff_euler_commands.txt". stiff_exact_test(): Normal end of execution. 23 June 2025 2:55:14.126 PM