with a max altitude more than or equal to 6100.0, and belonging to the same classification as altostratus, which cloud is this?
(AND meteorology.cloud (AND (JOIN meteorology.cloud.classification (JOIN (R meteorology.cloud.classification) m.01683s)) (le meteorology.cloud.maximum_altitude_m 6100.0^^http://www.w3.org/2001/XMLSchema#float)))