The standard_error_multiplier CF property of each field.
fl.standard_error_multiplier is equivalent to cf.List(f.standard_error_multiplier for f in fl).
fl.standard_error_multiplier = value is equivalent to for f in fl: f.standard_error_multiplier = value.
del fl.standard_error_multiplier is equivalent to for f in fl: del f.standard_error_multiplier.
See cf.Field.standard_error_multiplier for details.