def writeStrainInfoFN(strainNamesT, paramD):
    """Write strain numbers and names to strainInfoFN. Numbers are given
by the index in strainNamesT."""
    with open(paramD['strainInfoFN'], 'w') as f:
        for strainNum in range(len(strainNamesT)):
            f.write(str(strainNum) + '\t' + strainNamesT[strainNum] + '\n')
