SPICE Data for Mariner 10 (M10) (3/74 to 4/74)
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     This collection consists of a single SPK file, covering only 3/21/74
     to 4/4/74, which is the period of the first Mercury flyby. Quality of
     this data is entirely unknown. No other M10 SPICE data are available.
     Some modern image navigation results (camera pointing) were produced
     by Mark Robinson of Northwestern University, in conjunction with Tim
     Colvin of The Rand Corporation, but these have not been converted into
     C-kernels. (Whether or not they could be so converted with reliable
     results is unknown.)