Strange values for leaf dry mass

[Rekyt]

When looking at leaf dry mass I again identified weird trait values:

library("dplyr")
BIEN::BIEN_trait_trait("leaf dry mass") %>%
    count(trait_value, sort = TRUE) %>%
    head(5)
#>   trait_value   n
#> 1           * 426
#> 2           0 131
#> 3        0.01  78
#> 4        0.02  70
#> 5        0.04  68

It seems that there are values equal to "*". They all come from this dryad repository.