}

	si := cfg.SampleIndex
	si = sampleIndex(flagTotalDelay, si, "delay", "-total_delay", o.UI)
	si = sampleIndex(flagMeanDelay, si, "delay", "-mean_delay", o.UI)
	si = sampleIndex(flagContentions, si, "contentions", "-contentions", o.UI)
	si = sampleIndex(flagInUseSpace, si, "inuse_space", "-inuse_space", o.UI)
	si = sampleIndex(flagInUseObjects, si, "inuse_objects", "-inuse_objects", o.UI)

func (cfg *config) resetTransient() {
	current := currentConfig()
	cfg.Output = current.Output
	cfg.SourcePath = current.SourcePath
	cfg.TrimPath = current.TrimPath
	cfg.DivideBy = current.DivideBy
	cfg.SampleIndex = current.SampleIndex
}

// applyURL updates *cfg based on params.
func (cfg *config) applyURL(params url.Values) error {
	for _, f := range configFields {
		var value string
		if f.urlparam != "" {

// and the type/units of those values.
func sampleFormat(p *profile.Profile, sampleIndex string, mean bool) (value, meanDiv sampleValueFunc, v *profile.ValueType, err error) {
	if len(p.SampleType) == 0 {
		return nil, nil, nil, fmt.Errorf("profile has no samples")
	}
	index, err := p.SampleIndexByName(sampleIndex)
	if err != nil {
		return nil, nil, nil, err
	}
	value = valueExtractor(index)
	if mean {