enum {kF02,kF04,kF12,kF13,kF14,kF24, kF44,kNFElem}; // non-trivial elems of propagation matrix
enum {kK00,kK01,kK10,kK11,kK20,kK21,kK30,kK31,kK40,kK41, kNKElem}; // non-trivial elems of gain matrix
enum {kS00,kS10,kS11,kS20,kS21,kS22,kS30,kS31,kS32,kS33,kS40,kS41,kS42,kS43,kS44,kNSElem}; // elements of 5x5 sym matrix
enum {kF02,kF04,kF12,kF13,kF14,kF24, kF44,kNFElem}; // non-trivial elems of propagation matrix
enum {kK00,kK01,kK10,kK11,kK20,kK21,kK30,kK31,kK40,kK41, kNKElem}; // non-trivial elems of gain matrix
enum {kS00,kS10,kS11,kS20,kS21,kS22,kS30,kS31,kS32,kS33,kS40,kS41,kS42,kS43,kS44,kNSElem}; // elements of 5x5 sym matrix