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if(!inherits(pp,"ppp")) stop("data argument 'pp' must be of spatstat class \"ppp\"; see ?ppp")
if(is.null(tt)) tt <- marks(pp)
tt <- checktt(tt)
if(length(tt)!=npoints(pp)) stop(paste("Length of temporal vector does not match number of spatial observations\n npoints(pp) = ",npoints(pp),"; length(tt) = ",length(tt),sep=""))