tokens: Acknowledgments The authors would like to thank the reviewer Professor M. Peimbert for comments and corrections and for pointing out the possible blend of the λ4089.29 line with an Si iv line. The work of PJS was supported in part by the STFC (grant ST/J000892/1). The complete data generated in this work can be obtained in electronic format with full precision from the Centre de Données astronomiques de Strasbourg (CDS) data base (catalog VI/150). The fortran 77 data server is compiled and tested thoroughly using gfortran, f77 and Intel fortran compilers on Ubuntu 12.04 and Scientific Linux platforms. Representative sample results from all these compilers and on all those platforms are compared and found to be identical within the stated numerical accuracy.
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