def METHOD_NAME(self):
    """Number of simulated transients in covered area."""
    if self.lightcurves:
        lcs = json.loads(self.lightcurves)
        n_in_covered = 0
        if lcs['meta'] is not None:
            n_in_covered = n_in_covered + len(lcs['meta']['z'])
        if lcs['meta_rejected'] is not None:
            n_in_covered = n_in_covered + len(lcs['meta_rejected']['z'])
        return int(n_in_covered)
    else:
        return None