equation icon  2 '''' ''' 2 '' ' 2 729x Pk + 3888xP k[+ (17(82 +) 54x )P k( + 144)xP k + (90 + x )Pk( ) pEk '''' 810 pEk ''' 18(135 + 2x2) pEk '' = const.× 243 --- - ---- --- + -------2------ --- r x r x r 2 ( E )' 4 2 ( E)] - 30(162-+-x--) pk- + x--+-30(162-+-x-)- pk- . (367) x3 r x4 r