ISFDB Age Graph

      Quality Ratio (100x Magnification) vs. Age

     |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    
     |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    
     |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    
     |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    
     |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    
     |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    
     |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    
     |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    
24   |    |    |    |    X    |    |    |    |    |    |    |    |    |    |    |    |    
22   |    |    |    |    XX   |    |    |    |    |    |    |    |    |    |    |    |    
20   |    |    |    |  XXXXXX |    |    |    |    |    |    |   X|    |    |    |    |    
18   |    |    |    |X XXXXXX |X   |X  XX    |    |    |    |   X|    |    |    |    |    
16   |    |    |    |X XXXXXXXXXX  |XX XXX   |    |    |    | X X|    |    |    |    |    
14   |    |    | X  |XXXXXXXXXXXXXXXXXXXXXX XX  X |   X|X   | XXX|    |    |    |    |    
12   |    |    X X X|XXXXXXXXXXXXXXXXXXXXXX XX XX |   X|XX  X XXX|    |    |    |    |    
10   |    |    X X XXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXX XX|XXX XXXXX|    |    |    |    |    
8    |    |   XX XXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXX|XXXXXXXXX|    |    |    |    |    
6    |    |   XX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX|    |    |    |    |    
4    |    |   XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX|    |    |    |    |    
2    |    |   XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX|    |    |    |    |    
0    |    |   XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX|    |    |    |    |    
                                                                                          
     15   20   25   30   35   40   45   50   55   60   65   70