transverse_map_sector_generator

transverse_map_sector_generator is bugged when using a pyAT lattice:

ring = booster_upgrade(load_from_AT=True)

ret = transverse_map_sector_generator(ring, [2,5,8])
Traceback (most recent call last):

  Cell In[12], line 1
    ret = transverse_map_sector_generator(ring, [2,5,8])

  File ~/work/Python_dev/mbtrack2/mbtrack2/tracking/element.py:483 in transverse_map_sector_generator
    chro0 = _compute_chro(ring, positions[i])

  File ~/work/Python_dev/mbtrack2/mbtrack2/tracking/element.py:473 in _compute_chro
    chrox = np.interp(pos, s, Chrox)

NameError: name 's' is not defined