orientation and f is the relationship therebetween as graphically illustrated in fig5 it will be noted that the graph of the relationship f is symmetrical around a central value of the track angle that is equal to 0 u00b0 fig7 and 8 illustrate a relationship between azimuth angle and head reproduction output when a fixed track angle of 10 u00b0 is used with varying head azimuth angles it is to be noted that using a non zero azimuth angle affects both the angle of inclination of the head relative to the tape 39 s direction of magnetic orientation and also the effective relative speed of the head gap with respect to tape 4 both the effective relative speed and the angle of inclination in turn affect the level of head reproduction output thus the inclination of head h1 fig4 is given by u03b8 u03b1 and the loss due to the azimuth angle is proportional to cos a because the effective relative speed of the head is given by v h u00d7 cos u03b1 where v h is the head 39 s scanning speed accordingly the reproduction output for the a channel can be expressed as as shown in fig7 when a 10 u00b0 track angle is used in recording on an evaporation deposition tape the amount of head reproduction loss is not symmetrical with changes in azimuth angle if a 0 u00b0 azimuth is used as a center value in other words if a substantial and symmetrical difference in azimuth angles is selected such as for example 20 u00b0 for the a channel head and 20 u00b0 for the b channel head in order to obtain a substantial suppression of crosstalk there is a relatively large difference between the respective levels of.