| Step IV Magnets 240 MeV/c | ||||
|---|---|---|---|---|
  Compressors |
  No Return Yoke   |   Open Return Yoke   |   Closed Return Yoke   |   Closed Return Yoke & Flange   |
|   All Iron in Skin   | ||||
|   2mm Skin, No Iron inside   | ||||
|   2mm Skin, Reduced Core   | ||||
|   2mm Skin, 50mm Airgap, Reduced Core   |
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|   2mm Skin, Single Solid Cube in Centre   |
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|   2mm Skin, 9 Solid Cubes   | ||||