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Format of a two-line element file

Below is an example of a two-line element file as retrieved from the celestrak website. 
GPS BII-09 (PRN 15)
1 20830U 90088A   06309.09710768 -.00000032  00000-0  10000-3 0   265
2 20830  54.7168 260.7569 0097904 157.1221 203.2965  2.00567202118167
GPS BIIA-11 (PRN 24)
1 21552U 91047A   06308.89729016 -.00000031  00000-0  10000-3 0  2425
2 21552  54.9028 259.4352 0089962 312.6220  46.5962  2.00363712112342
GPS BIIA-12 (PRN 25)
1 21890U 92009A   06308.39247311 -.00000035  00000-0  10000-3 0  2083
2 21890  54.7972  71.1463 0128449 284.0349  74.5177  2.00564394107705
GPS BIIA-14 (PRN 26)
1 22014U 92039A   06309.13213105 -.00000091  00000-0  10000-3 0  1296
2 22014  56.7976  18.2135 0173209  46.9025 314.5804  2.00557547 98488

Original: Mark Wieringa