Comparison of the best redshift estimate z_best from 3D-HST and the peak photometric redshift z_p in the UltraVISTA-detected catalogue for galaxies located in the area covered by the grism observations with . Galaxies with a spectroscopic or grism redshift in the 3D-HST catalogue are indicated as filled circles, while the galaxies having a photometric redshift in the 3D-HST catalogue only are shown as open circles. Black symbols correspond to galaxies passing our colour selection, while red symbols show galaxies removed by the colour selection. The blue line shows the one-to-one relation.