# Charting: pass intraday data to transformer

This page provides information on configuring the Charting blade’s subject prefix and logging.

## charts-prefix

Prefix for subjects that the Charting blade will provide data for.

There is generally no need to change this configuration option; the Caplin Trader charting library will always request charts using the /CHARTS prefix.

**Syntax**: `charts-prefix <prefix>`

**Default value**: `/CHARTS`

**Example**: `charts-prefix  /CHARTS/`

## log-level

Determines the errors and events that are reported to the _transformer.log_ log file when Caplin Transformer is operating.

**Syntax**: `log-level <level>`

| Level | Description |
| --- | --- |
| DEBUG | Reports all errors and events. |
| INFO | Reports events and information regarding normal operation and all errors included in the WARN, NOTIFY, ERROR and CRIT debug levels. |
| WARN | Reports minor errors and all errors included in the NOTIFY, ERROR and CRIT debug levels. |
| NOTIFY | Report errors regarding data corruptions and all errors included in the ERROR and CRIT debug levels. |
| ERROR | Reports serious errors regarding network connections and all errors included in the CRIT debug level. |
| CRIT | Reports non-recoverable errors that prevent the module from running. |

**Default value**: `INFO`

## log-file

Name of file to write debug messages to.

**Syntax**: `log-file <filename>`

**Default value**: `charting.log`