tokens: have been used for the calculations of lifetimes of excited levels. These lifetimes have been included in Table 1 . There are a number of even-parity metastable levels that can decay to lower levels only via forbidden electric quadrupole (E2) and magnetic dipole (M1) transitions. The most extensive calculation of radiative transition probabilities and lifetimes for the metastable levels of Ti II has been presented by Deb et al. ( 2009 ). Comparison of their lifetimes with the present results is given in Table 3 . We note a very reasonable agreement between the two calculations with standard deviation of about 20%. However, there are a few levels with considerable disagreement. For example, the lifetimes of the levels of Deb et al. ( 2009 ) exceed our values by five times. For the state we found extremely strong, almost half and half, mixing with the 3 d 2 4 s 2 P state. It makes even the configuration assignment for these levels somewhat ambiguous. The matrix elements for the levels with such strong mixing are very sensitive to the details of calculation and it may be the reason for a large disagreement with the CIV3 calculation in this case. Another example of large discrepancies is the levels which also show strong mixing with the 3 d 3 configuration levels. In this case, the lifetimes from the CIV3 calculation are two times smaller than our values. Table 2 Present Calculated Line Strengths ( S ), Oscillator Strengths ( f ik ), and Transition Probabilities ( A ki (s −1 )) for E1, E2, and M1 Transitions in Ti II Together with Their Wavelengths λ ( Å ) (This table is available in its entirety in machine-readable form.) Only a portion of this table is shown here to demonstrate its form and content. A machine-readable version of the full table is available. Table 3 Comparison of the Calculated and Experimental Lifetimes (ns) for the Metastable States in Ti II The comparison of the present calculated lifetimes with the measurements of Hartman et al. ( 2003 , 2005 ) and Palmeri et al. ( 2008 ) has been presented in Table 3 for seven levels belonging to the 3 d 3 , 3 d 2 4 s , and 3 d 4 s 2 configurations. We have also included available theoretical results of Bautista et al. ( 2006 ) and Deb et al. ( 2009 ) in Table 3 . Our calculated lifetimes closely agree with the measurement of Palmeri et al. within the experimental uncertainties. However, the differences with the measurements of Hartman et al. ( 2003 ) are up to a factor of 2. It indicates the importance of correction due to the repopulation effects that was incorporated in the measurement of Palmeri et al. ( 2008 ). It may also be the reason of discrepancies between the previous theoretical results of Deb et al. ( 2009 ) and Bautista et al. ( 2006 ) and experimental results of Hartman et al. ( 2003 , 2005 ). Good agreement of the present results with measured lifetimes of Palmeri et al. ( 2008 ) confirms that our target wave function expansions adequately include main correlation
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