[scribus] Equivilent to Pages Per Inch

[scrib at wexfordpress.com]

When figuring book spine dimensions in the USA  we use the attribute of the 
interior paper used called PPI or pages per inch.
 The page count is divided by the PPI, a small factor for the cover 
thickness is added and the result is the spine width in inches.
  
 Printers here will either quote the PPI or at least provide a method to 
calculate it.
  
 In the metric world things are different of course.  What is the attribute 
of paper stock equivalent to PPI? How is it used to calculate
 the spine dimensions?
  
 All replies appreciated.
  
 John Culleton
  
  
  

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