Dust effects corr^dust on the derived central surface brightnesses of disks fitted with exponential functions. The symbols represent the measurements while the solid line are polynomial fits to the measurements. The plots represent the ratio between the apparent and intrinsic average central surface-brightness, ΔSB, expressed in magnitudes, versus inclination (1 − cos(i)), for the B and K optical bands. From bottom to top, the curves are plotted for , and 8.0.