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Operating Income (Tables) | 12 Months Ended
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Dec. 31, 2017
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Summary of Operating Income | The operating income is broken down in the following manner:
|  | December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | (thousands of Euros) |
Revenues |  |  | 202 |  |  |  | — |  |  |  | — |
Research tax credit |  |  | 5,685 |  |  |  | 7,228 |  |  |  | 9,330 |
Subsidies |  |  | 279 |  |  |  | 303 |  |  |  | 271 |
Other operating income |  |  | — |  |  |  | 1,554 |  |  |  | 2,308 |
Total |  |  | 6,166 |  |  |  | 9,084 |  |  |  | 11,909 |

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