Append the calibration parameters as variables of the netcdf file.

    Keyword arguments:
    filename -- the name of a netcdf file.

def calibrate(filename):
    """
    Append the calibration parameters as variables of the netcdf file.

    Keyword arguments:
    filename -- the name of a netcdf file.
    """
    params = calibration_to(filename)
    with nc.loader(filename) as root:
        for key, value in params.items():
            nc.getdim(root, 'xc_1', 1)
            nc.getdim(root, 'yc_1', 1)
            if isinstance(value, list):
                for i in range(len(value)):
                    nc.getvar(root, '%s_%i' % (key, i), 'f4', ('time', 'yc_1', 'xc_1' ))[:] = value[i]
            else:
                nc.getvar(root, key, 'f4', ('time', 'yc_1', 'xc_1'))[:] = value