A sample .SUM file looks like
W46908480918 image name
2014 NOV 12 17:20:03.128 utc
2048 2048 500 65535 NPX, NLN, THRSH pic size, lower and upper dn thresholds
0.1356800000D+03 0.1044000000D+04 0.9380000000D+03 MMFL, CTR focal length, px/ln center (boresight/optical axis)
-0.9665063720D+01 0.1326644487D+02 -0.6673084308D+01 SCOBJ s/c-object vector (body fixed)
-0.6442479111D+00 -0.1829032409D-01 0.7645979944D+00 CX pixel unit vector (body fixed)
0.5935707119D+00 0.6184779444D+00 0.5149357652D+00 CY linel unit vector (body fixed)
-0.4823053379D+00 0.7855892670D+00 -0.3875965231D+00 CZ boresight unit vector (body fixed)
0.7254908676D+00 -0.3292717307D+00 0.6043534796D+00 SZ sun unit vector (body fixed)
74.07410 0.00000 0.00000 0.00000 74.07410 0.00000 K-MATRIX
0.00000D+00 0.00000D+00 0.00000D+00 0.00000D+00 DISTORTION always zero these days (distortion comes in elsewhere)
0.1007758363D-02 0.1482813397D-02 0.8902614968D-03 SIGMA_VSO formal scobj uncertainty
0.3071768580D-04 0.3093941486D-04 0.1565302183D-04 SIGMA_PTG formal pointing uncertainty
LANDMARKS
AO0001 2049.39 668.15
AO0002 2020.70 644.81
AO0003 2035.17 708.66 landmark px/ln centers
BD0009 1902.39 884.05
BD0010 1891.13 909.86
...
EK0022 675.73 1371.97
EQ0088 721.76 738.13
FI0002 727.77 220.40
LIMB FITS landmark-on-limb centers (none here)
END FILE
