Projection effects corr^proj on the derived B-band photometric parameters of disks fitted with exponential functions (black) and with Sérsic functions (red): scale-lengths, axis-ratios, and central surface brightnesses. The symbols represent the measurements while the solid lines are polynomial fits to the measurements.The plots represent the inclination dependence of left − the ratio between the intrinsic scale-lengths, R_i, and the intrinsic (radial) scale-length of the volume stellar emissivity, R₀; middle − the ratio between the intrinsic axis-ratio, Q_i, and the axis-ratio of an infinitely thin disk, Q₀; with the dashed line we overplotted the analytic formula from Driver et al. (2007), which is a modification of the Hubble formula from Hubble (1926), to take into acount the thickness of the disk; right − the ratio between the central surface brightness of the fitted images and of the coresponding simulated images, ΔSB₀, expressed in magnitudes. In the case of a Sérsic fit, R_i (left panel) is the equivalent intrinsic scale-length, calculated from the derived intrinsic Sérsic effective radius, , using the relation (which is an exact transformation only for n^sers = 1).