my.spct <- polyester.spct
filter_properties(my.spct)
filter_properties(my.spct) <- NULL
filter_properties(my.spct)
filter_properties(my.spct, return.null = TRUE)
filter_properties(my.spct) <- list(Rfr.constant = 0.01,
thickness = 125e-6,
attenuation.mode = "absorption")
filter_properties(my.spct)
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