μ E  = μ   and   π E  = ( 1 − 1 n − m + 1    )  π       ( 7 )        MathType@MTEF@5@5@+=feaafiart1ev1aaatCvAUfKttLearuWrP9MDH5MBPbIqV92AaeXatLxBI9gBaebbnrfifHhDYfgasaacH8akY=wiFfYdH8Gipec8Eeeu0xXdbba9frFj0=OqFfea0dXdd9vqai=hGuQ8kuc9pgc9s8qqaq=dirpe0xb9q8qiLsFr0=vr0=vr0dc8meaabaqaciaacaGaaeqabaqabeGadaaakeaafaqabeqadaaabaacciGae8hVd02aaSbaaSqaaGqabiab+veafbqabaGccqGH9aqpcqWF8oqBaeaacqqGHbqycqqGUbGBcqqGKbazaeaacqWFapaCdaWgaaWcbaGae4xraueabeaakiabg2da9maabmaabaGaeGymaeJaeyOeI0YaaSaaaeaacqaIXaqmaeaacqWGUbGBcqGHsislcqWGTbqBcqGHRaWkcqaIXaqmaaaacaGLOaGaayzkaaGae8hWdaNaaCzcaiaaxMaadaqadaqaaiabiEda3aGaayjkaiaawMcaaaaaaaa@49E8@