Methods, systems and apparatuses are provided for transmitting and receiving space-time block coded data in a wireless communications system with co-operative relays. The arrangement includes at least two magnetic field generators each having two free ends, wherein the heating element is arranged in or close to a plane defined by the free ends. The invention further relates to genetic complements of plants of variety CH134921. Then, a part of the first nitride layer above the first oxide layer and below the second oxide layer is removed in order to expose the area of the structure.