====== How to cut on number of TT hits on tracks ======
===== Problem =====
Some of the long tracks don't have TT hits. However, it may be useful to distinguish in an analysis long tracks with and without TT hits.

===== Code =====
In your Combine Particles or wherever LoKi cuts can be applied, do:
<code python>
MyAlgo.Preambulo += [ 'from LoKiTrigger.decorators import *' ] 
...
Code =  '(TRCUT ( 2 < TrIDC ('isTT') )'
</code>
This will demand tracks with more than 2 TT hits.