I’m not an expert at reading g-code, but here’s the definition of the G1 command:
Fnnn is the feedrate (which is the speed of the print head movement)
Ex.xxxx is the amount of extrusion (mm)
So in your example, it basically says:
“Move to X174.202 Y156.200, extrude 1.7413mm and move the print head at a speed of 603 mm/s”
Fnnn looks constant until set by another G1/G0 command.
The E value is probably derived from the flow rate (multiplier), extrusion width, layer height, nozzle diameter, filament diameter… and probably other factors listed in the slicer settings.
EDIT: Dammit, piercet beat me to the answer… as I was typing/researching.