Librational response times the mean radius of the icy shell of Europa by taking into account the orbital perturbations over 4500 days a) and a zoom over 800 days b). The amplitude increase in panel a) is due to the contribution of long-periodic Fourier terms with different phases. The initial date for the plot is January 1st 2026 corresponding to the expected date of arrival of EJSM at Jupiter. The interior model comes from the Table 4.