Cartan #0:
split: 0; compact: 4; complex: 0
canonical twisted involution: e
twisted involution orbit size: 1; fiber size: 16; strong inv: 16
imaginary root system: D4
real root system is empty
complex factor is empty
real form #4: [0,2,13] (3)
real form #1: [1,3,12,14] (4)
real form #2: [4,6,9,11] (4)
real form #3: [5,7,8,10] (4)
real form #0: [15] (1)