**Syntax**

` >>> STEP (UNSCALED): max_step`

**Parent Command**

` >> CONVERGENCE`

**Subcommand**

` -
`

**Description**

This command defines the maximum allowable size of the scaled (*f _{i} = σ_{pi}*, default;

*f*; keyword

_{i}= p_{i}`CURRENT`) or unscaled (

*f*= 1, keyword

_{i}`UNSCALED`) update vector Δ

**p**per iTOUGH2 iteration. The step length of the scaled parameter update vector is defined as follows:

This is a global step size limitation as opposed to the one specified for each individual parameter (see command `>>>> STEP).` Limiting the global step size may make the inversion more stable. Parameter *max_step* should be chosen large enough, so that the size of the proposed step size |Δ**p**| is reduced to |Δ**p**_{max})| only during the first few iterations. The figure below illustrates that limiting the step size maintains the direction of the step taken in the parameter space.

**Example**

` > COMPUTATION
>> CONVERGENCE
>>> number of ITERATIONS : 10 (may need more iterations!)
>>> limit scaled STEP size to: 1.0 [dimensionless]
<<<
<<`

**See Also**

` >>>> STEP (p)
`