For the degrees within the semitone, the conventional notation is
completed by three additional signs and their inversions:
e.g. arrows after Franz Richter Herf and Rolf Maedel, arrows after Ezra Sims, or a
combination of arrow after Gould, half arrow (hook) after Sims, and
See further notations at Alterations and Ekmelily.
|+1/12||+1/6||+1/4||−1/4||−1/6||−1/12||Alteration, tone fraction|
|0||→||16⅔||→||33⅓||→||50||←||66⅔||←||83⅓||←||100||Distance in cents tempered|
|91⅔||--||8⅓||--||25||--||41⅔||--||58⅓||--||75||--||91⅔||--||108⅓||Reach of hearing in cents tempered|
|||||||||||||Richter Herf / Maedel notation|
The additional signs apply to the respective measure, just like the conventional accidentals.
After Richter Herf / Maedel, these signs are always placed above the notes and a diagonal slash cancels them. However, together with chords, bent arrows are used for better legibility; for example: