Less than 180°,25,000 ft;  27,000 ft;    29,000 ft;    31,000 ft;    33,000 ft;    35,000 ft;    37,000 ft;    39,000 ft;    41,000 ft or higher levels at intervals of 4,000 ft.  ,
180° but less than 360°,26,000 ft;  28,000 ft;    30,000 ft;    32,000 ft;    34,000 ft;    36,000 ft;    38,000 ft;    40,000 ft;    43,000 ft or higher levels at intervals of 4,000 ft.  ,