Q: I have the photometry measured in 3 filters. Can I compute photometric redshifts?

A: There are no technical problems running hyperz with only 3 filters, but the results will be not very reliable. If you look at the probability functions probably you will find multiple solutions and extended ``plateaux''.

Q: Do I need near-IR or UV to compute photometric redshifts?

A: No, you don't need specifically near-IR or UV. But then the accuracy in several redshift zones, especially at $z>1$, is going to be severely decreased. You can check Bolzonella et al. (2000) for a complete study.

Q: Do I need to have the photometry in all the filters for each object?

A: If your object was in the field but not detected, then you have to set its magnitude $m>90$ and choose between the different options that hyperz provides to deal with such case. If your object was not in the field, then set its magnitude $m<1$ and hyperz will not consider it in the computation.

Q: Do I need to cite you if I write a paper using this code?

A: It will be greatly appreciated to include a note saying that your results were obtained using the publicly available software hyperz, to refer to the paper Bolzonella M., Miralles J.-M. & Pelló R. (2000) and to include the http address where you downloaded it.

Q: I have an unsolvable problem, who can I contact?

A: You can contact either Micol at micol@ifctr.mi.cnr.it, Roser at roser@ast.obs-mip.fr or Joan-Marc at jmiralle@eso.org.

Q: When are you going to release a new version?

A: If you want to be informed of new releases, bug fixes or improvements, just email to any of us.

micol bolzonella