On 16 Jan 2011, at 15:03, Rich Mellor wrote:

> 190 line_diff=(101*Yratio/hi)*wid/('135.5041505'*Xratio)

Blimey! How do you get 135.5041505? Surely you could let us have twenty more 
significant figures?

Jan Jones, on page 115, says that 

  OPEN#3,SCR_137x100 will give a square window. I found that a rounded 135 
seemed more accurate.

George
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