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5 changes: 2 additions & 3 deletions gh_pages/_source/session4/Introduction-to-Perception.md
Original file line number Diff line number Diff line change
Expand Up @@ -10,13 +10,12 @@ The start of most perception processing is ROS message data from a sensor. In t
1. Create a new directory for this exercise:
```
mkdir ~/ex4.2
cd ~/ex4.2
cd ~
cp ~/industrial_training/exercises/4.2/table.pcd .
```

1. Publish pointcloud messages from the pre-recorded `table.pcd` point cloud data file:
1. Publish pointcloud messages from the pre-recorded `table.pcd` point cloud data file (Run this from your home directory, where the file was placed):
```
cd ~
rosrun pcl_ros pcd_to_pointcloud table.pcd 0.1 _frame_id:=map cloud_pcd:=orig_cloud_pcd
```
1. Verify that the `orig_cloud_pcd` topic is being published: `rostopic list`
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