Effect of photometric redshift scatter on redshift distribution. True LSST redshift distribution (solid blue curve) divided into nine photometric redshift bins (shown by the solid green curves) for Gaussian redshift errors with (a) σ₀ = 0.02, (b) σ₀ = 0.05, and (c) for modified Lorentzian redshift errors with γ₀ = 0.02. The red line denotes the CMB lensing kernel, and the dashed vertical orange lines mark the true redshift bins. The full LSST redshift distribution and CMB lensing kernel are normalised to unit maximum.