Cov txheej txheem tsim khoom muaj lub kaw lus sau plua plav (kev tso pa tawm ua tau raws li cov qauv hauv tebchaws), nrog rau tus nqi rov qab tau iav tawg ntau dua 90%. Qee cov khoom siv thev naus laus zis tsis muaj hmoov txhuas. Cov thawv ntim iav tuaj yeem rov ua dua 100%. Tus nqi rov qab tau ntawm iav tawg ntau dua 90%. Cov txheej txheem tsim khoom yuav tsum tau nruab nrog lub kaw lus sau plua plav, nrog rau kev tso pa tawm ua tau raws li cov qauv hauv tebchaws.
Txhawb kom siv cov thev naus laus zis sib dua (degree sib dua ≤ 1.0).