The Column between 13 & 14 show the octave break of the fundamental. Playing this note can be useful in determining if you have a correctly made flute that is capable of acceptable cross fingered notes. In accordance with the rules of Mother Nature it indicates that the top three fingering holes have been correctly placed in the flute sound chamber. This octave break note should be within 10% of the upper octave of the fundamental note and can be checked by using a chromatic tuner. Playing the upper octave of the fundamental in this way can also be useful when playing your instrument.
Column 1 shows the fundamental notes (all playing holes covered). Flute playing holes are progressively tuned to the RED notes reading from left to right.
Columns 1, 3, 5, 7, 13 are the notes of the Primary Scale for a six hole, modes 1 & 4, flute.