Provided is a radio communication technique, more particularly, a method and apparatus for formatting a transmission packet according to significance of data. Examples of charge transport compounds of this invention are those having the following generic formula: nY where R is an arylamine group; Q comprises an aromatic hydrazone linking group; Y comprises a bridging group between RQ groups; and n is an integer between 2 and 6. With this configuration, the laser beam which has passed through the laser transmission plate is scattered by the rough portion and the intensity of the laser beam applied to the skin is not concentrated to the center. A fluorocarbon based deposit deposited when removing the reduced deposit containing titanium by the plasma generated from the second process gas containing the fluorine-based gas is removed by plasma generated from a third process gas containing oxygen. The at least two sets of wheels are aligned on mutually orthogonal axes.