Hi Killian,
The "cec" and "spe" prefixes indicate the module model option. The 6-parameter single diode model is called "CEC" and the single-point efficiency model is called "SPE". You only need to set the value of (or read values from) variables that you are using. If you are using the CEC module model in your simulations, then the "cec" variables apply, and the "spe" variables do not apply.
Best regards,
Paul.