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| NGPL Mid-Continent Basis Swap (Platts IFERC) |
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 | Non-Member Customer Initial |  |  |  | Member Customer Initial |  |  |  | Clearing Member and Customer Maintenance |  |  |  | Assessments Spot Month |  |  |  |
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 |  | Tier 1: $1,620 |  |  |  | Tier 1: $1,320 |  |  |  | Tier 1: $1,200 |  |  |  | N/A |  |  |
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 | Non-Member Customer Initial |  |  |  | Member Customer Initial |  |  |  | Clearing Member and Customer Maintenance |  |  |  | Assessments Spot Month |  |  |  |
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 |  | Tier 2: $1,350 |  |  |  | Tier 2: $1,100 |  |  |  | Tier 2: $1,000 |  |  |  | N/A |  |  |
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 | Non-Member Customer Initial |  |  |  | Member Customer Initial |  |  |  | Clearing Member and Customer Maintenance |  |  |  | Assessments Spot Month |  |  |  |
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 |  | Tier 3: $675 |  |  |  | Tier 3: $550 |  |  |  | Tier 3: $500 |  |  |  | N/A |  |  |
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 | Non-Member Customer Initial |  |  |  | Member Customer Initial |  |  |  | Clearing Member and Customer Maintenance |  |  |  | Assessments Spot Month |  |  |  |
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 |  | Tier 4: $405 |  |  |  | Tier 4: $330 |  |  |  | Tier 4: $300 |  |  |  | N/A |  |  |
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 | Non-Member Customer Initial |  |  |  | Member Customer Initial |  |  |  | Clearing Member and Customer Maintenance |  |  |  | Assessments Spot Month |  |  |  |
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 |  | Tier 5: $270 |  |  |  | Tier 5: $220 |  |  |  | Tier 5: $200 |  |  |  | N/A |  |  |
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 | Inter-Commodity Straddle Margin |  |  |  | |  |  |  |
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 |  | Tier 1 - Any Spread |  |  |  | $25 |  |  |
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NOTES:
| † | For cleared contracts, the spot month assessment is effective on the day submission deadline terminates. |
| | For traded contracts, the spot month assessment is effective as of the close of business one day prior to the last trading day. |
| * |
Tier 1: 1st nearby month (spot month)
Tier 2: 2nd nearby
Tier 3: 3rd through 6th nearby
Tier 4: 7th through 12th nearby
Tier 5: 12th and greater |
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