Dismax params, mm < explanation

[ram_sj]

Hi,
consider this minimum match params in dismax query handler, 

      <str name="mm">
        2&lt;-1 3&lt;-2 6&lt;100%
      </str>

I requested solr to match atleast two fields, which i understood from the
documents. Can someone give me explanations for other params in it? 

"lt;-1 3"

"lt;-2 6"

"lt;100%"

how are they significant? 

thanks
ram
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