In a journal article I am translating (from Japanese into English) regarding
PWBs, there are many statements about "lines between pins." Low-end boards
have 2 lines between pins.  Normal boards have 3 lines between pins. High
end boards have 4 lines between pins (at 125/125 lines and spaces). The
highest density production boards, apparently, have 5 lines between pins.

What is all of this talking about? Lines of *what*?

Is this referring to a ratio of pin-to-pin spacing vs. line spacing on the
board?

Any help you can give me would be appreciated.

Thanks in advance.

Warren Smith, Friendly Neighborhood Japanese Technical Translator

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