cdm/src/main/java/ucar/nc2/iosp/sigmet/SigmetIOServiceProvider.java
static float calcStep(float range_first, float range_last, short num_bins) {
    float step = (range_last - range_first) / (num_bins - 1);
    BigDecimal bd = new BigDecimal(step);
    BigDecimal result = bd.setScale(2, RoundingMode.HALF_DOWN);
    return result.floatValue();
  }
static float calcStep(float range_first, float range_last, short num_bins) {
    float step = (range_last - range_first) / (num_bins - 1);
    BigDecimal bd = new BigDecimal(step);
    BigDecimal result = bd.setScale(2, RoundingMode.HALF_DOWN);
    return result.floatValue();
  }
Calculate distance between sequential bins in a ray

@param range_first range of first bin in centimeters
@param range_last  range of last bin in centimeters
@param num_bins    number of bins
@return float distance in centimeters with precision of two decimal