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Step-by-step guide

One can add several 'modifiers' to a key in square brackets to control number of columns, separator string and format:

[key!c%F'S']
c -> number of columns
F -> C-style formatting
S -> separator string


Examples:

[latitude!11] -> print array using 11 columns
[latitude','] -> print array with entries separated by a comma
[latitude%.5f] -> print real numbers with 5 decimal places
[latitude!11%.5f','] -> combination of the above

Note: to print all the values on one line, set the number of columns to 0 (zero).