def METHOD_NAME(self):
    """
        computes theme.minwidth string
        based on traffic.format and traffic.graphlen parameters
    """
    minwidth_str = ""
    if self._graphlen > 0:
        graph_len = int(self._graphlen / 2)
        graph_prefix = "0" * graph_len
        minwidth_str += graph_prefix
    minwidth_str += "1000"
    try:
        length = int(re.match(r"{:\.(\d+)f}", self._format).group(1))
        if length > 0:
            minwidth_str += "." + "0" * length
    except AttributeError:
        # return default value
        return "1000.00KiB/s"
    finally:
        minwidth_str += "KiB/s"
    return minwidth_str