function z_delanoe_function, am, bm, alpha, beta, N0, D0


; calcualtes the radar reflectivity for a delanoe-type ice psd
; input and output cgs

; am, bm are the mass-dimensional power law coeffecients
; D0,N0
; are the gamma function parameters of the dist. alpha and beta are the xponents

az=(0.19)*((6./(3.14159*0.92))^2)*((am)^2)
bz=(2.*bm)-6.

return, (N0*az/beta)*(D0^(bz+7.))*gamma(1.+((alpha+bz+7.-beta)/beta))
end