Nothing
xyz2ll<-function(x)
{
### lat here is lattitude (not co-lat)
RADDEG = 180/pi
y<-x/sqrt(sum(x*x))
lat <- asin(y[3])*RADDEG ;
lon <- atan2(y[2], y[1])*RADDEG ;
return(c(lat,lon))
}
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