Correlation of RESIK and RHESSI fluxes for energy range 3.00–3.66 keV. Different colours represent observations from different flares (see Table 2). The analysis of RHESSI data was made applying grids 1F, 3F, 4F, 6F, 8F, and 9F. The continuous black line represents the linear regression, the coefficients of which are calculated by the least squares method. The dashed black line represent equal fluxes.