Further improvements

	modified:   exp4/data/Airfoil.xlsx
	modified:   exp4/report/diag/integral.nb
	modified:   exp4/report/diag/meas_pressure.pdf
	modified:   exp4/report/diag/pressure_points.pdf
	modified:   exp4/report/diag/wing_profile.nb
	modified:   exp4/report/report4.tex