# Open data

^{Image: NAC_2015-12-10T01.31.06.651Z_ID10_1397549000_F22; Credit: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA}

## Distribution in 3D of dust and gas

The MiARD project (in particular the University of Bern) has developed a numerical activity model for the outgassing and ejection of dust from the comet. The predictions of this model, for two sets of assumptions, are made available here. The data consists of 8 space separated ASCII files with seven columns of data. These seven columns (x, y, z, number density,u, v, w) are:

- x,y,z spatial coordinates in metres from centre of comet (Cheops reference frame)
- the number density of the gas or dust (m-3)
- u, v, w the x,y,z components of the velocity vector (m/s)

For each model (inhomogeneous or purely insolation driven) there is one file for the gas number density and velocity, and one file for each of the three dust particle sizes. The filenames should be self-explanatory. For more information, see the associated deliverable report.