# fix_modify AtC sample_frequency

## syntax

fix_modify AtC sample_frequency [freq]

- freq (int) : frequency to sample field in number of steps

## examples

`fix_modify AtC sample_frequency 10`

## description

`Specifies a frequency at which fields are computed for the case where time filters are being applied.`

## restrictions

`Must be used with the hardy/field AtC fix ( see fix atc command ) and is only relevant when time filters are being used.`

## related

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## default

`none`