Nothing
co_refract_forward=function( a, p=1010, t=283) {
d2r = pi/180.
w = (a<15)
r = 0.0166667/tan((a + 7.31/(a+4.4))*d2r)
r[w] = 3.569*(0.1594 + .0196*a[w] +
.00002*a[w]^2)/(1.+.505*a[w]+.0845*a[w]^2)
tpcor = p/1010. * 283/t
r = tpcor * r
return(r)
}
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