& & &\
41 & 67374.97 & 67374.92 & & & & & &\
42 & 67501.84 & 67501.66 & & & & & &\
43 & 67631.43 & 67631.28 & & & & & &\
44 & 67763.93 & 67763.75 & & & & & &\
45 & 67899.61 & 67899.43 & & & & & &\
46 & 68037.98 & & & & & & &\

Level energies
==============

The laser and VUV-FT transition frequencies were converted to [A$^1\Pi$]{}(0), [e$^3\Sigma^-$]{}(1) and [d$^3\!\Delta$]{}(4) level energies using accurate level energies for the ground state [@George1994]. The combination of [A$^1\Pi$]{}(0) level energies and [B$^1\Sigma^+-$A$^1\Pi$]{}$(0,0)$ emission line frequencies also permitted the determination of [B$^1\Sigma^+$]{}(0) level energies. As a verification of our various frequency calibrations we compared the deduced [B$^1\Sigma^+$]{}$(0)$ energy levels to those calculated from an unpublished [B$^1\Sigma^+-$X$^1\Sigma^+$]{}$(0,0)$ photoabsorption spectrum also recorded at SOLEIL [@BX_unpublished]. Comparing level energies determined from B$\rightarrow$A and A$\leftarrow$X spectra against this direct B$\leftarrow$X measurement we find agreement within 0.01[cm$^{-1}$]{}, which is the estimated uncertainty of our wavenumber calibration.

All [A$^1\Pi$]{}(0), [e$^3\Sigma^-$]{}(1) and [d$^3\!\Delta$]{}(4) level energies are listed in Table \[Levels\] and represent weighted averages of the different experiments. The low-$J$ values are taken from the more accurate 