09 May 2025 9:16:48.378 PM kdv_ift_test(): FORTRAN90 version Test kdv_ift(), which solves the Korteweg-deVries equation using the FFT method with an integrating factor. gnuplot_surface(): FORTRAN90 version gnuplot_surface: data stored in "kdv_ift_data.txt". gnuplot_surface: plot commands stored in "kdv_ift_commands.txt". kdv_ift_test(): Normal end of execution. 09 May 2025 9:16:48.469 PM