HR diagram of 13 974 nearby p-mode pulsators classified as β Cep or δ Sct stars. For the β Cep stars, we imposed 0 < σ_ϖ/ϖ < 0.2, while we demanded 0 < σ_ϖ/ϖ < 0.03 for the δ Sct stars. The blue line at hot temperatures is the β Cep star instability strip from Burssens et al. (2020) for spherical degree ℓ ∈ {0, 1, 2} and radial order n ∈ {0, …, 6}. The blue lines represent the blue and red edge of the δ Sct instability strip for n = 1 modes, and the fuchsia line the blue edge for n = 4 modes. All instability strips are for solar metallicity.