Another excellent discussion of the TLE format and orbital parameters may be found at: orbitessera. Note that although these are called two line elements, the inclusion of a line with the object name makes each entry take up 3 lines in the file.
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1 NNNNNU NNNNNAAA NNNNN.NNNNNNNN +.NNNNNNNN +NNNNNN +NNNNNN N NNNNN
2 NNNNN NNN.NNNN NNN.NNNN NNNNNNN NNN.NNNN NNN.NNNN NN.NNNNNNNNNNNNNN
Line 0 is a twentyfour character name.
Lines 1 and 2 are the standard TwoLine Orbital Element Set Format
identical to that
used by NORAD and NASA. The format description is:
Line 1  

Column  Description 
01  Line Number of Element Data 
0307  Satellite Number 
08  Classification (U=Unclassified) 
1011  International Designator, last two digits of launch year, 2000+ if < 57. 
1214  International Designator, launch number of the year 
1517  International Designator, piece of the launch 
1920  Epoch Year, last two digits of year, 2000+ if < 57 
2132  Epoch Day of the year and fractional portion of the day 
3443  First Time Derivative of the Mean Motion 
4552  Second Time Derivative of Mean Motion (decimal point assumed) 
5461  BSTAR drag term (decimal point assumed) 
63  Ephemeris type 
6568  Element number 
69  Checksum (Modulo 10) (Letters, blanks, periods, plus signs = 0;
minus signs = 1)

Line 2  

Column  Description 
01  Line Number of Element Data 
0307  Satellite Number 
0916  Inclination [Degrees] 
1825  Right Ascension of the Ascending Node [Degrees] 
2733  Eccentricity (decimal point assumed) 
3542  Argument of Perigee [Degrees] 
4451  Mean Anomaly [Degrees] 
5363  Mean Motion [Revs per day] 
6468  Revolution number at epoch [Revs] 
69  Checksum (Modulo 10) 