The unit cell is defined by the length of its three edges
and by the three angles α, β, et γ between two vertices.
Depending upon the selected Bravais lattice, some of these parameters are fixed or dependents. Only independent parameters may be changed, entries corresponding to constant or dependent values are disabled.
Lengths must be given in picometers and angles are expressed in degrees.
You can choose a symmetry space group using the spin button or check the "Automatic" button to ask to Gnome Crystal to detect the correct space group for you. Currently Gnome Crystal does not make any attempt to move the origin to find the best possible space group, so the detected group might not be the expected one.