:<math>\mbox{P}_{\rm dh} = \frac{\gamma_{\rm h}\cos \theta_{\rm h}\mbox{P}_{\rm dm}}{\gamma_{\rm m} \cos \theta_{\rm m}}</math> | :<math>\mbox{P}_{\rm dh} = \frac{\gamma_{\rm h}\cos \theta_{\rm h}\mbox{P}_{\rm dm}}{\gamma_{\rm m} \cos \theta_{\rm m}}</math> |