Matrices for student StevenBellenot
Ellipse angle = 346.930771 degrees
 E  =

    2.7953743  - 0.2491775
  - 0.2491775    1.7798311
 D  =

    1.7219868    0
    0            2.8532187
 X  =

    0.2261282  - 0.9740976
    0.9740976    0.2261282
1.721987, (0.226128, 0.974098), 1.342695, 76.930771
1.721987, (-0.226128, -0.974098), -1.798897, -103.069229

2.853219, (-0.974098, 0.226128), 2.913492, 166.930771
2.853219, (0.974098, -0.226128), -0.228101, -13.069229

Arrows touch conic

Conic centered

xarrows calculation

Lmax calculation

Lmin calculation