H ( i , D , L , S ) = ( 2 D  / S )  i   ∑ r = 0  L  S − L             E q u a t i o n   3   MathType@MTEF@5@5@+=feaafiart1ev1aaatCvAUfKttLearuWrP9MDH5MBPbIqV92AaeXatLxBI9gBaebbnrfifHhDYfgasaacH8akY=wiFfYdH8Gipec8Eeeu0xXdbba9frFj0=OqFfea0dXdd9vqai=hGuQ8kuc9pgc9s8qqaq=dirpe0xb9q8qiLsFr0=vr0=vr0dc8meaabaqaciaacaGaaeqabaqabeGadaaakeaacqWGibascqGGOaakcqWGPbqAcqGGSaalcqWGebarcqGGSaalcqWGmbatcqGGSaalcqWGtbWucqGGPaqkcqGH9aqpdaWcaaqaaiabcIcaOiabikdaYmaaCaaaleqabaGaemiraqeaaOGaei4la8Iaem4uamLaeiykaKYaaWbaaSqabeaacqWGPbqAaaaakeaadaaeWbqaaiabdofatnaaCaaaleqabaGaeyOeI0IaemitaWeaaaqaaiabdkhaYjabg2da9iabicdaWaqaaiabdYeambqdcqGHris5aaaakiaaxMaacaWLjaacbeGae8xrauKae8xCaeNae8xDauNae8xyaeMae8hDaqNae8xAaKMae83Ba8Mae8NBa4MaeeiiaaIae83mamdaaa@575D@