Table 1. Spreading Rates for Each Segment (Unit: km/m.y.)

Segment  Full      Half (West)    Half (East)
                   	   
N2       25.1±0.7  13.0±0.6 a 	12.4±0.5 a
                   
N1       24.7±0.7  11.5±0.5 a 	13.4±0.6 a
                   
S1       26.0±0.9  13.1±0.6 a	13.3±0.6 a
                           
S2       24.4±0.9  12.2±0.5 a	12.8±0.6 a
                           
S3       24.5±0.7  12.3±0.5 12.2±0.5

a Anomaly  1n  (0 Ma) data are not included in the  half-rate calculation.