Get the chlorophyll axis label for observed or log-space, including units
chllab(logspace = TRUE)logical indicating if chlorophyll is in log space, otherwise observed
An expression indicating (log)-chlorophyll in the appropriate units
## default
chllab()
#> expression(paste("log-Chloropyhll-", italic(a), " (", italic(mu), 
#>     "g ", L^-1, ")"))