It is easy.
Just write [code] above the code lines, and [/code] below the lines like this
[code]
code line 1
code line 2
code line n
[/code]
It will appear like this:
# gains = 20.7 22.9 25.4 28.0 29.7 32.8 33.8 36.4 37.2 38.6 40.2 42.1 43.4 43.9 44.5 48.0 49.6
# gain = -10 is max gain (55.0 with AGC)
Alternatively instead of [code] above, and [/code] below, you can:
place 3 backticks ``` above the code, and 3 backticks ``` below the code, like this:
```
code line 1
code line 2
code line n
```
The backtick (grave-accent) key is left of number 1 key on US keyboard, as shown in image below.
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