equation icon  u = u''- 1-r''2[htail+ (htail+ 2htail)_O_''a + (htail+ 2htail)_O_''a_O_''b + htail_O_''a_O_''b_O_''c], (610) ( 4 000 )00a 0a0 ab0 0ab abc m- '' ''b ''c '' xa = 1 + 3 r Ebc_O_ _O_ xa 1 [ 1 ( 4m ) ] + -r''2 - -ht0a0ila + ht0aial0 + ht0aailb- ht0aibal+ htaabil0 + ---Eab _O_''b + (Qabc - Qbca + Qcab)_O_''b_O_''c, 2 2 3 (611)