  The cyano radical (CN) is a key molecule across many different factions of
astronomy and chemistry. Accurate, empirical rovibronic energy levels with
uncertainties are determined for 8 doublet states of CN using the \Marvel{}
(Measured Active Rotational-Vibrational Energy Levels) algorithm. \notrans{}
transitions were validated from \nosources{} different published sources to
generate \noenergy{} spin-rovibronic energy levels. The empirical energy levels
obtained from the \Marvel{} analysis are compared to current energy levels from
the \Mollist{} line list. The \Mollist{} transition frequencies are updated
with \Marvel{} energy level data which brings the frequencies obtained through
experimental data up to \alert{77.3\%} from the original 11.3\%, with 92.6\% of
the transitions with intensities over 10$^{-23}$ cm/molecule at 1000 K now
known from experimental data. At 2000 K, 100.0\% of the partition function is
recovered using only \Marvel{} energy levels, while 98.2\% is still recovered
at 5000 K.
