Details of asset variations to be performed on an ad in the control ad group.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v25/resources/experiment_arm.proto)

| Fields ||
|---|---|
| ## `asset_details[]` | `https://developers.google.com/google-ads/api/reference/rpc/v25/ExperimentArm.AssetDetail` Details for each asset that is being modified from the base ad. |
| ## `base_ad` | `string` Associated base ad resource name. |
| ## `base_ad_group` | `string` Associated base AdGroup resource name. |