Interpolated synthetic bolometric LCs (left panels) and photospheric velocities (right panels) after varying the progenitor initial mass between 9 and 25 M_⊙ (panel a), the explosion energy between 0.1 and 1.5 foe (panel b), the ⁵⁶Ni mass between 0.005 and 0.08 M_⊙ (panel c), and the ⁵⁶Ni mixing between the 20% and 80% of the final structure in mass coordinate (panel d). The values increase from purple to yellow. Eighteen models are shown for each parameter being varied. The parameters not being varied are fixed at an initial mass of 10 M_⊙, explosion energy of 1.3 foe, M_Ni of 0.01 M_⊙, and 50% of ⁵⁶Ni mixing, with the exception of the panel showing the ⁵⁶Ni mixing effect for which a larger M_Ni of 0.06 M_⊙ is used to enable better visualisation of this effect.