The invention relates to improved transformation and regeneration of alfalfa, Medicago sativa. The first data symbol is transmitteds to the receiver using a first diversity branch. Another aspect includes summing, by each of a second plurality of summing modules of a second compressor, a respective column of output bits of the matrix. The inner wall section has a depth of about 50 to 100 \u03bcm from the opening end on the guide pin insertion side.