Campbell Scientific CR1000 Measurement and Control System - Manual (Page 28)

Section 1. Introduction
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Italic — titles of publications, software, sections, tables, figures, and examples.
Bold italic — CRBasic instruction parameters and arguments within the body text.
Blue — CRBasic instructions when set on a dedicated line.
Italic teal — CRBasic program comments
Lucida Sans Typewriter font — CRBasic code, input commands, and output
responses when set apart on dedicated lines or in program examples.