The available assets of the guarantee fund for risks relating to the agricultural spreading of urban or industrial sewage sludge are invested by Caisse Centrale de Réassurance in the assets mentioned in Article R. 332-2. When the amounts capitalised by the fund are less than 15 million euros, the assets are invested in the assets referred to in 1° to 3° of this article. When these amounts reach 15 million euros, the fund’s assets are subject to the rules set out in articles R. 332-3 and R. 332-3-1. For the purpose of calculating these limits, the amount of each category of assets is related to the amount of the fund’s available assets.