(color online) The fitting result of the temperature dependence of the superconducting fluctuating specific heat ΔC (T, μ₀H)/T = [C (T, μ₀H) − C (T, 8 T) / T with various perpendicular magnetic fields (μ₀H = 5 T, 6 T, 7 T). The points are the experiment data of Ba_1−xK_xFe₂As₂. The solid lines are the theoretical results.