Ratio of the number of emergent photons relative to model W7. The bar graph shows the ratio of the integrated number of emergent photons of models considered here relative to W7. Note that photons in energy bands below 0.6 MeV are not relevant to the cosmic gamma-ray background near-MeV region, which is our main consideration, but we plot them for completeness. Please note the good agreement within 5% of the 3D models with the w7fm model, as well as with the W7 model. The model w7dt has more ⁵⁶Ni mass than a normal SN Ia.