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: B4
real root system is empty
complex factor is empty
real form #4: [0,2,5,8,10,13] (6)
real form #3: [1,4,6,11] (4)
real form #2: [3,9,12,14] (4)
real form #1: [7] (1)
real form #0: [15] (1)


Cartan #1:
split: 0; compact: 2; complex: 1
canonical twisted involution: 2,3,4,3,2,1,2,3,4,3,2
twisted involution orbit size: 12; fiber size: 4; strong inv: 48
imaginary root system: A1.B2
real root system: A1
complex factor is empty
real form #4: [0,2] (2)
real form #3: [1] (1)
real form #2: [3] (1)


Cartan #2:
split: 0; compact: 2; complex: 1
canonical twisted involution: 1,2,3,4,3,2,1
twisted involution orbit size: 4; fiber size: 4; strong inv: 16
imaginary root system: B3
real root system: A1
complex factor is empty
real form #4: [0,2,5] (3)
real form #3: [1,4,6] (3)
real form #2: [3] (1)
real form #1: [7] (1)


Cartan #3:
split: 1; compact: 1; complex: 1
canonical twisted involution: 2,3,4,3,2,1,2,3,4,3,2,1
twisted involution orbit size: 6; fiber size: 2; strong inv: 12
imaginary root system: B2
real root system: B2
complex factor is empty
real form #4: [0,2] (2)
real form #3: [1] (1)
real form #2: [3] (1)