The SetFirstSigma node modifies a sequence of sigma values by replacing the first sigma value in the sequence with a custom value. It takes an existing sigma sequence and a new sigma value as inputs, then returns a new sigma sequence where only the first element has been changed while keeping all other sigma values unchanged.

## Inputs

| Parameter | Description | Data Type | Required | Range |
| --- | --- | --- | --- | --- |
| `sigmas` | The input sequence of sigma values to be modified | SIGMAS | Yes | - |
| `sigma` | The new sigma value to set as the first element in the sequence (default: 136.0) | FLOAT | Yes | 0.0 to 20000.0 |

## Outputs

| Output Name | Description | Data Type |
| --- | --- | --- |
| `sigmas` | The modified sigma sequence with the first element replaced by the custom sigma value | SIGMAS |

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