Photo Index Column Titles and Descriptions 
The column headings are as follows:
-  C1 Counter
-  The number of the shot according to the camera's film counter 
-  C2 Negative Number
-  The number on the film negative, providing a more definitive reference
-  C3 CD Number
-  This gives which CD (there are five in total) the photograph is on
-  C4 CD Frame Number
-  This gives the CD frame number (there are up to 108 on each CD) for each shot
-  C5 Weather Log
-  An 'x' in this column indicates the photograph forms part of the hourly weather observation set
-  C6 Documentary 
-  An 'x' in this column indicates the photograph is a general interest picture
-  C7 Other
-  An 'x' in this column indicates a photograph outside the above two categories
-  C8 Date
-  All dates are given in UTC
-  C9 Time
-  All times are UTC
-  C10 Sun
-  An 'x' in this column indicates prevailing conditions were clear and sunny
-  C11 Overcast
-  An 'x' in this column indicates cloudy conditions
-  C12 Rain
-  An 'x' in this column indicates prevailing local rainshowers 
-  C13 Comments
-  Any relevant comments are included in this column