# Questions about indicators

| Question                                                                                                                                                                          | Answer                                                                                                                                                                                                                                                                                                                                                                       |
| --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Can I write indicators myself?                                                                                                                                                    | Yes, you can write them in the C# language. Examples with code are available in the [following section of the documentation](https://support.tiger.trade/v/english/development-for-tiger.trade-windows/indicator-examples).                                                                                                                                                  |
| Which folder should I add the custom indicators to?                                                                                                                               | You should add custom indicators to the folder C:\Users\\%USERNAME%\Documents\TigerTrade\Indicators. After adding it to the folder you should restart the terminal, afterwards the indicator will be displayed in the list of indicators.                                                                                                                                    |
| Can I use indicators created for Tiger.com Windows in some third-party terminals or in Tiger.com macOS App?                                                                       | No, they are created only for use in the Tiger.com terminal.                                                                                                                                                                                                                                                                                                                 |
| What connections can be configured to view data for the [Open Interest](https://support.tiger.com/english/windows/chart/main-indicators-in-chart-window/open-interest) indicator? | Open interest indicator is supported for all the symbols that are available in Tiger.com Windows via the [connections](https://support.tiger.com/english/settings/connections).                                                                                                                                                                                              |
| How can the [Open Interest](https://support.tiger.com/english/windows/chart/main-indicators-in-chart-window/open-interest) indicator turn negative?                               | The indicator turns negative if open interest decreases compared to the previous period.                                                                                                                                                                                                                                                                                     |
| What should I do if the [Heatmap indicator](https://support.tiger.com/english/windows/chart/main-indicators-in-chart-window/heatmap) is not displayed?                            | Select [clusters ](https://support.tiger.com/english/windows/chart)as the data type or turn on the Auto Select Data Type. Please note that the indicator starts showing data from the datetime when it was added on the chart.                                                                                                                                               |
| What should I do if the Volume Profiles indicator is not displayed?                                                                                                               | Change the data type to clusters and the price increment to 100 or 1,000. Or (if required) extend the vertical scale as shown below (clickable).![](https://2207507098-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FOSB2AVpWygd626dcnm1c%2Fuploads%2FqkwBuihcl8FhbWpdXoNZ%2FVolumeProfiles.gif?alt=media\&token=55eab941-30eb-44c3-9f2f-45a2c5a1d1d1) |