>>> UPHILL: max_uphill
By default, an inversion is stopped if more than 10 consecutive unsuccessful parameter steps have been proposed. The default can be overwritten by max_uphill. Each unsuccessful step results in an increase of the Levenberg parameter (see command >>> LEVENBERG), leading to a smaller step size deflected towards the gradient.
>> STOP either if
>>> : 10 ITERATIONS have been completed
>>> : 3 TOUGH2 runs were INCOMPLETE
>>> : 5 unsuccessful UPHILL steps have been proposed