Photometric redshift accuracy for four synthetic bursts (z = 1.5, z = 2.5, z = 3.5 and z = 4.5) with a smoothly broken power law as continuum spectrum against the location of the break wavelength. Horizontal dashed lines mark the input redshift, and the best-fit photo-z for an unbroken continuum, and black solid lines the average best fit photometric redshift when following Sect. 2.4. Grey shaded areas represent the typical 1σ uncertainty, derived in similar manner as in Sect. 2.6.