About two PPLs

[Xiaolong Li]

Hi,
    I have installed srilm successfully, thanks a lot! Now I have a small question about PPL output:
    when I run "ngram" to count PPL of a testing text, there are two ppls output: ppl and ppl1, what's the difference of them? 
（I can't find this from the documents).
       
    
    Thanks a lot.

Hans Li    
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