def outdict(self, ndigits=3):
        """Return dictionary structure rounded to a given precision."""

        outdict = {}
        for i in range(EMIR_NBARS):
            ibar = i + 1
            cbar = 'slitlet' + str(ibar).zfill(2)
            outdict[cbar] = {}
            outdict[cbar]['_csu_bar_left'] = \
                round(self._csu_bar_left[i], ndigits)
            outdict[cbar]['_csu_bar_right'] = \
                round(self._csu_bar_right[i], ndigits)
            outdict[cbar]['_csu_bar_slit_center'] = \
                round(self._csu_bar_slit_center[i], ndigits)
            outdict[cbar]['_csu_bar_slit_width'] = \
                round(self._csu_bar_slit_width[i], ndigits)

        return outdict
Return dictionary structure rounded to a given precision.