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Financial instruments - Fair value of the convertible senior secured notes (Details) - Convertible Senior Secured Notes - Financial liabilities at fair value through profit and loss category - Level 3 | Jun. 30, 2023 | Dec. 31, 2022
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Risk-free rate |  |
Financial instruments |  |
Significant unobservable input liabilities | 0.044 | 0.041
Dividend yield |  |
Financial instruments |  |
Significant unobservable input liabilities | 0 | 0
Volatility |  |
Financial instruments |  |
Significant unobservable input liabilities | 80.0 | 65.0
Credit spread |  |
Financial instruments |  |
Significant unobservable input liabilities | 27.50 | 26.38

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- Definition The value of significant unobservable input used in the measurement of the fair value of liabilities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2022-03-24 -Paragraph 93 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2022-en-r&anchor=para_93_d&doctype=Standard -URIDate 2022-03-24 + Details
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