Unit prefix d is used as key for *decameter* and *decimeter* in str_to_nm definition.

[KelSolaar]

Hello,

I noticed that d is used as key for decameter (dam) and decimeter (dm) in the str_to_nm definition:

def str_to_nm(value, multiplier, units):
    v = float(value.replace(',', '.'))

    # avoid rounding errors if the value is already in nanometres
    if multiplier == 'n' and units == 'm':
        return v

    unit_prefix = { 'Y':1e24, 'Z':1e21, 'E':1e18, 'P':1e15, 'T':1e12, 'G':1e9, 'M':1e6, 'k':1e3, 'h':1e2, 'd':1e1, '': 1, 'd':1e-1, 'c':1e-2, 'm':1e-3, 'u':1e-6, 'n':1e-9, 'p':1e-12}

    v *= unit_prefix[multiplier]

    if units == 'Hz':
        v = 299792458. / v * 1e9
    elif units == 'm':
        v *= 1e9
    else:
        raise ValueError

    return v

The C++ code uses da for decameter: https://github.com/afichet/spectral-exr/blob/master/lib/Util.h#L82C17-L82C19

Cheers,

Thomas