IVExtractResult         IV feature extraction
IV_4K                   Damp Heat Plus Dynamic Mechanical Load Indoor
                        Accelerated Test I-V Curve.
IV_5M_1                 I-V Curves from External Solar Testing
                        Laboratory.
IV_5M_2                 I-V Curves from External Solar Testing
                        Laboratory.
IV_daystar              Outdoor Time Series I-V Curve Data from SDLE
                        SunFarm.
IV_step1                A data frame of IV curve with 1 step.
IV_step2                A data frame of IV curve with 2 step.
IV_step3                A data frame of IV curve with 3 step.
IV_timeseries           Outdoor Time Series I-V Curve Data from SDLE
                        SunFarm.
IVfeature               Calculate IV feature from a IV curve
IVsteps                 Calculate steps of IV curve
IVuncertain             Uncertainty for IV feature extraction
