WHAT ARE THE EIGHT MODES OF VIKRUTI FORM OF VEDIC CHANTING?

There are eight modes of Vikruti form of Vedic chanting as follows:
(1) JatA
(2) MAlA
(3) DaNda
(4) RekhA
(5) Ratha
(6) Dhvaja
(7) SikhA
(8) Ghana

JatA mAlA daNda rekhA ratha dhvaja  SikhA ghanAh !
kramamASritya  nirvrttA vikArA ashta viSrutAh !!