... Coma[*]
Appendix A is only available in electronic form at http://www.edpsciences.org 
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... respectively[*]
For Abell 1367, we use the average of the redshifts reported in this paper. 
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... IRAF[*]
Image Reduction and Analysis Facility, written and supported at the National Optical Astronomy Observatory. 
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... USNO[*]
United States Naval Observatory. 
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... cluster[*]
The transmitance peak of the filter is 0.85, and the transmitance for the H$\alpha $ lines at the averages velocities of both clusters corresponds to 0.82 and 0.76 for Coma and Abell 1367 respectively. 
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...[*][*]
Contamination due the H$\beta$ or [O III] emission lines of background objects is not important. For some of these objects the redshift was measured and only less than 10% were found to be non members of the cluster. 
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Copyright ESO 2002