ERRATA

1. Page 5, line after equation (2):
   Please replace ``azimuthal'' with ``meridional''.

2. Page 6, equation (11):
   Please cross out the minus sign next to the equal sign.

3. Page 8, equation (24):
   Please change the third ``-'' to ``+'' on the right-hand side.

4. Page 8, equation (26):
   Please inset ``-'' immediately after the equal sign in front of the fraction.

5. Page 9, equation (31):
   Please replace ``beta'' with ``beta/(1-beta)''

6. Page 10, top, (2,6) entry of matrix M:
   Please enter a minus sign ``-'' in front of k₂

7. Page 12, top, (2,5) entry of matrix M:
   Please replace ``l<sub>0</sub>'' with ``I₀''.

8. Page 12, top, (3,1) entry of matrix M:
   Please replace ``l<sub>1</sub>'' with ``I₁''.

9. Page 35, middle of the page, expression for hat S₈)
   Please replace ``k<sub>1</sub>'' with ``K₁''.

10. Page 36, middle of the page, expression for T₅)
    Please replace ``mu<sup>2</sup>'' with ``mu₂''.

11. Page 36, middle of the page, expression for T₇)
    Please replace ``mu<sup>2</sup>'' with ``mu₂''.