How to use the sunpy.util.common_base function in sunpy

'freq_axis': data.freq_axis,
            'start': data.start,
            'end': specs[-1].end,
            't_delt': data.t_delt,
            't_init': data.t_init,
            't_label': data.t_label,
            'f_label': data.f_label,
            'content': data.content,
            'instruments': _union(spec.instruments for spec in specs),
        }
        if mask is not None:
            arr = ma.array(arr, mask=mask)
        if nonlinear:
            del params['t_delt']
            return Spectrogram(arr, **params)
        return common_base(specs)(arr, **params)

)):
            new[n, :] = data[row, :]
            freq_axis[n] = data.freq_axis[row]
        params = {
            'time_axis': one.time_axis,  # Should be equal
            'freq_axis': freq_axis,
            'start': one.start,
            'end': one.end,
            't_delt': one.t_delt,
            't_init': one.t_init,
            't_label': one.t_label,
            'f_label': one.f_label,
            'content': one.content,
            'instruments': _union(spec.instruments for spec in specs)
        }
        return common_base(specs)(new, **params)