Current spot++ is still not calibrated with new data. Pengjia calibrated for the older data, so we have a calibration of the raster size. For 1.4 V amplitude we get about 1.6 cm diameter at target. I guess some tricks on the quads could be played too to make the spot reach the require 2cm x 2cm. We will try a bit bigger raster next time since we have a rough calibration now.