An example of use of SNAPSim, a software package for simulating Dark Energy missions

We show an example of use of SNAPsim, a software package intended to simulate dark energy missions. We point out how our software, though designed with the proposed SNAP mission in mind, can be used for simulating a generic mission; we show this by simulating an ongoing mission. We focus on one of the most important sources of systematic error in such missions: the effect that a zero point filter calibration uncertainty has on the final precision of the cosmological parameters. We show that in the presence of calibration uncertainties a significant reduction in the error of the cosmological parameters can be achieved if all the distance to the Supernovae observed by the mission are fitted simultaneously.