Version 2.1kn5 (March (?) 2006)

$\bullet$ Fixed bug which affected high ionization models which included nickel. This caused segmentation faults, and was caused by an incorrect data type flag in the atomic data for He-like Ni.

$\bullet$ Changed step size algorithm to prevent stepping beyond the column density specified in the input. This will not be accurate for constant pressure clouds in which the temperature is changing rapidly.