What does the M105 / M155 line format (T:20.38 /185.00 @:127) mean?

The M105 G-Code for printer firmwares like Marlin prints lines such as

m105_example.txt

T:20.38 /185.00 @:127

T:20.38 /185.00 @:127

The RepRap wiki has extensive documentation about those lines. Here are the most important ones

T:actual /setpoint Temperature of the hotend in °C
T0:actual /setpoint Temperature of the first hotend in °C (only if you have multiple hotends)
T1:actual /setpoint Temperature of the second hotend in °C (only if you have multiple hotends)
B:actual /setpoint Temperature of the heated bed in °C
C:actual /setpoint Temperature of the printer case in °C
@:value : Current PWM output value of the hotend. Typically, 8-bit PWM is used, so 255 is full-scale.
B@:value : Current PWM output value of the bed. Typically, 8-bit PWM is used, so 255 is full-scale.

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