patRIL: paternal RIL number
matRIL: maternal RIL number
mtx1: replicate 1 fecundity
mtx2: replicate 2 fecundity
mtx3: replicate 3 fecundity
SP: subpopulation 12 = paternal pA1 x maternal pB2, 21 = paternal pA2 x maternal pB1
chWeek: Week (block effect)
Condo: rearing condo (connected set of drosophila vials 6 x 8)