This circle graph shows the moment by each rod component at the point of grip front, that is the end of action length.

This graph can be viewed as how the rod caster (fisher) feels the contents of moment force at rod hand.  The author named this as "Feels of cast",  that means how a caster feels bamboo, or fly line more  in the casting.  Such a rod with more percentage of bamboo weight, may be felt as rather a heavy rod in casting with less feeling of fly line, under a certain G (4 e.g.) speed with standardized line length.  Oppositely, with more fly line percentage, a caster can feel fly line weight  more than bamboo weight on his hand while casting.  This would become a measure for a rod maker when deciding the taper, height of Action Genome or Stress Curve.

The author's measurement is to try to this ratio almost equal between bamboo and fly line under 4G speed and standardized length of line to fish, e.g. 40 ft for #4 line.

What level of standard is to be selected, is at each user's discretion.