...¹

For a complete list of operators, consult the Reference Guide

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...etok²

etok is the value of 2m_e/$\hbar^{2}_{}$ in units on Ų/eV, and is useful for converting x-ray energy values to photo-electron wavenumber: set kval = sqrt(etok * (energy-e0))

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...³

where ``obvious'' means that an array named $group.pre already exists. This really is mediocre definition of obvious, especially if you're writing scripts to automate the processing of lots of data. On the other hand, if you're casually strolling through your data at a command-line prompt, it's probably fine.

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...⁴

it is on the ``TODO list'' to check for and warn about this possibility, which is hardly ever intended

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