Small-angle X-ray-scattering experiments for supercritical CF3H were carried out. As in the previous results for supercritical CO2, the correlation lengths and density fluctuations for CF3H form a ridge along the extension of the coexistence curve of gas and liquid when the contour maps of their values are drawn in the P-T phase diagram. However, the ridges of the two samples do not overlap perfectly with each other in the diagram. The extension curves correspond to the loci of the phase transition with higher order.