We show that masses of binary black hole mergers are overestimated. since a large gravitational redshift is not taken into account. Such a phenomenon occurs due to time dilation in a close neighborhood of any black hole. This fact allows us to explain a high mass gap between observed binary neutron stars and calculated binary black hole mergers. https://countryscenesaddleryandpetsuppliers.shop/product-category/ventech-elite-sports-medicine-boot/