Phase-resolved transmission spectrum at the Na, Hα, K D₁ lines (top row), and three of the control lines (bottom row). Signatures arising from the center-to-limb variation and Rossiter-McLaughlin effects have been corrected. Three nights have been combined and rebinned to the phase and velocity grid. Dashed lines mark the first and fourth contacts of the transit. Slanted dotted lines indicate the radial velocity shift induced by the planet orbital motion at the expected radial velocity semi-amplitude K_p = 167 km s⁻¹. Top row: excess absorption (traced in blue color) with a velocity shift during the transit, which agrees with the expected planet orbital motion; bottom row: does not exhibit any significant excess absorption with a regular velocity shift.