Overview of the velocity field of the stripped gas for the simulation presented in Fig. 1 at epoch 1.7 Gyr for H I (left) and for H II (right). A threshold of N_H I at 10¹⁵ atoms cm⁻² is applied for both. Since we only analyzed a 60-kiloparsec-wide cube around the galaxy, we see a sharp cutoff of the data in the H II map. The galaxy is located at the left bottom of the figure, as indicated by the red cross and the gray ellipse, which are the same as in Fig. 1.