Comparison of outer disk orientation parameters to those in HyperLeda, and to the P3 orientation parameters corresponding to fixed ﹩{\mu }_{3.6}=25.5﹩ mag arcsec⁻² isophote. In the upper row axial ratios are compared: the green line indicates the running median of HyperLeda (or P3) axial ratio, calculated in bins of 100 galaxies; gray indicates the rms scatter in the bin. Red line indicates unit slope. The labels give the median difference and standard deviation of the difference compared to P4: P4 axial ratios are generally larger than those in HyperLeda while the difference to P3 is small. The lower frames displays the absolute difference in the position angles: squares mark deviant points with ﹩| {\rm{\Delta }}\mathrm{PA}| \gt 15^\circ ﹩ for ﹩b/a\lt 0.5﹩. In the upper panels only galaxies with orientation uncertainty flag “ok” are included, while in the lower panels also galaxies with flag “z” are included.