# Aerosol Number-Size distribution

In the functions of this package an aerosol number-size distribution is assumed to be a `pandas DataFrame` where

**Index : pandas DatetimeIndex**

- Timestamps

**Columns : float**

- Size bin geometric mean diameters
- Unit: m
    
**Values : float**
    
- Normalized concentrations, dN/dlogDp
- Unit: cm-3