For a collection, the upper and lower limits of the x-axis
pull_limits(x, ...) # S3 method for collection pull_limits(x, ...)
| x | A spectra collection  | 
    
|---|---|
| ... | further arguments passed to or from other methods(not currenctly used).  | 
    
A vector of int.
#> [1] -2.123166e-05 8.999979e+00