How to read version markings?

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Seatrout and Salmon lines have markings to distinguish the various versions (V25.1, V26.6, etc.).  The markings omit the "V2" part and only represent the last three characters (5.1, 6.6, etc.).  Note that a Seatrout V25.1 and a Salmon 25.1 will have the same markings.  Please distinguish them based on their weight, length, and diameter.

Read the markings starting at the tip of the line.  If you place the line's tip left, you can read the markings like two roman numerals - separated by a larger space (representing the ".").  Short markings (less then 1/8" or 3 mm) represent a "I" (or "one").  Longer markings (between 1/4" and 3/8", 7 to 11 mm) represent a "V" (or "five").  Some versions may have an extra long marking about twice as long as a "V".  That would be an "X" (or "ten").  The order of the markings matters just like it does for the Roman numerals.  A "V" followed by a "I" represents a 6 - while a "I" before the "V" represents a 4.