  Energy levels and radiative rates are reported for transitions in Cl-like W
LVIII. Configuration interaction (CI) has been included among 44 configurations
(generating 4978 levels) over a wide energy range up to 363 Ryd, and the
general-purpose relativistic atomic structure package ({\sc grasp}) adopted for
the calculations. Since no other results of comparable complexity are
available, calculations have also been performed with the flexible atomic code
({\sc fac}), which help in assessing the accuracy of our results. Energies are
listed for the lowest 400 levels (with energies up to $\sim$ 98 Ryd), which
mainly belong to the 3s$^2$3p$^5$, 3s3p$^6$, 3s$^2$3p$^4$3d,
3s$^2$3p$^3$3d$^2$, 3s3p$^4$3d$^2$, 3s$^2$3p$^2$3d$^3$, and 3p$^6$3d
configurations, and radiative rates are provided for four types of transitions,
i.e. E1, E2, M1, and M2. Our energy levels are assessed to be accurate to
better than 0.5%, whereas radiative rates (and lifetimes) should be accurate to
better than 20% for a majority of the strong transitions.
