(42)The Commission should also be empowered to adopt delegated acts in accordance with Article 290 TFEU in respect of technical adjustments to Directive 2006/49/EC to clarify definitions to ensure uniform application of that Directive or to take account of developments on financial markets; to adjust the amounts of initial capital prescribed by certain provisions of that Directive and specific amounts relevant to the calculation of capital requirements for the trading book to take account of developments in the economic and monetary field; to adjust the categories of investment firms eligible for certain derogations to required minimum levels of own funds to take account of developments on financial markets; to clarify the requirement that investment firms hold own funds equivalent to one quarter of their fixed overheads of the preceding year to ensure uniform application of that Directive; to align terminology and definitions with subsequent relevant acts; to adjust technical provisions of that Directive on the calculation of capital requirements for various classes of risk and large exposures, on the use of internal models to calculate capital requirements and on trading in order to take account of developments on financial markets or in risk measurement or accounting standards, or in Union legislation, or which have regard to the convergence of supervisory practices; and to take account of the outcome of the review of various matters relating to the scope of Directive 2004/39/EC.