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[sumo-user] Questions about routeSampler

I'm tryng to get a better understanding of demand generation. 
I made a simple network and let routeSampler generate traffic
Warning: no routes pass edge 'E10' (count 128)
Warning: no routes pass edge 'E112' (count 89)
Wrote 1151 routes (20 distinct) achieving total count 1407 (81.71%) at 11 locations. GEH<5 for 100.00%
Warning: underflow locations: count 3, min 89.00 (('E112',)), max 128.00 (('E10',)), mean 105.00, Q1 89.00, median 98.00, Q3 128.00 (total 315)
  1. Why is GEH<5 for 100% if no routes passes E10 and E112? Are the missing counts not taken into account?
  2. What means underflow locations: count 3 
  3. Are the posterior values the quantiles of all counts or only of the counts that are also used (i.e. all except count 128 and count 89)? 
    With both possibilities, I get other values
Are there any publications about the routeSampler besides the documentation?
Thanks in advance

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