> For the complete documentation index, see [llms.txt](https://swatplus.gitbook.io/io-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://swatplus.gitbook.io/io-docs/introduction-1/connectivity/hru.con/hru.md).

# 'obj'

The pointer to the object data file is a foreign key referencing the unique ID in the respective object data file. The header of this column is different in each connect file.

| Connect file   | Column header | Object data file                                                                      |
| -------------- | ------------- | ------------------------------------------------------------------------------------- |
| hru.con        | hru           | [**hru-data.hru**](/io-docs/introduction-1/hydrologic-response-units/hru-data.hru.md) |
| hru-lte.con    | hlt           | [**hru-lte.hru**](/io-docs/introduction-1/hydrologic-response-units/hru-lte.hru.md)   |
| rout\_unit.con | rtu           | [**rout\_unit.rtu**](/io-docs/introduction-1/routing-units/untitled.md)               |
| aquifer.con    | aqu           | [**aquifer.aqu**](/io-docs/introduction-1/aquifers/aquifer.aqu.md)                    |
| chandeg.con    | lcha          | [**channel-lte.cha**](/io-docs/introduction-1/channels/channel-lte.cha.md)            |
| reservoir.con  | res           | [**reservoir.res**](/io-docs/introduction-1/reservoirs/reservoir.res.md)              |
| recall.con     | rec           | [**recall.rec**](/io-docs/introduction-1/point-sources-and-inlets/recall.rec.md)      |
| exco.con       | exc           |                                                                                       |
| delratio.con   | dlr           |                                                                                       |
| outlet.con     | out           | No data file                                                                          |