[R] Johansen test

[aurumor]

Hi all, I am working on exporting "Johansen test statistics" (Johansen test:
"ca.jo" in package "urca")to Excel. The problem is that the function output
is not a number, but like this:

##################################################### 
# Johansen-Procedure Unit Root / Cointegration Test # 
##################################################### 

The value of the test statistic is: 2.7821 9.5965 

I want only (2.7821,9.5965), but I don't know how to "extract" these numbers
from the output. The output object is of type "S4". Can anyone please help
me? Thanks.
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