#' @param by loon plot can be separated by some variables into multiple panels.
#' This argument can take a \code{\link{formula}},
#' \code{n} dimensional state names (see \code{\link{l_nDimStateNames}})
#' an \code{n}-dimensional \code{vector} and \code{data.frame} or
#' a \code{list} of same lengths \code{n} as input.
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