What does LTR mean?

I'm planning on building on building an MMC Cap.  From the equations on the 
net that I have seen say to match my Cap to my NST.  However when I use the 
MMC2 program and I chose LTR.  It comes up with a diffrence capacitance then 
I would if I use the standard cap calcs.   Almost twice the value in some 
cases.   Does LTR stand for Larger the Resonant?  If so, Why would I want to 
do this?
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