Rate coefficients of the electron related collisions (excitation and ionisation, top) and hydrogen related collisions (excitation and charge-exchange, bottom) for Na (left) and K (right). Initial levels of the transitions are labelled in rows and final levels are labelled in columns. The arrows point towards the transition that separates the hydrogen collisional excitation data from Barklem et al. (2012) and the data calculated using the formula from Kaulakys (1985). The colour scale at the left is for the Na Rates and the colour scale at the right is for the K rates.