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    // 멤버 변수
    public ObservableCollection<PmPowerItem> TxPowerItems

    void LinqTestCode()
    {
        // 이 부분은
        // TxPowerItems 컬렉션을 채우는 코드
        // TxPowerItems.Add(pmItem);

        // 아래 LINQ 코드를 분석해 보세요
        // groupTemp 변수는 어떤 형태의 값이 채워지나요?
        
        var groupTemp = from data in TxPowerItems
                        group data by data.Path into newData
                        orderby newData.Key
                        select new
                        {
                            Key = newData.Key,
                            Temps = newData.ToList()
                        };        
    }
  
    // PmPowerItem은 아래와 같이 단순한 ValueObject 입니다.
    public class PmPowerItem : ViewModelBase
    {
        private int _number;
        private string _type;
        private string _probeId;
        private string _path;
        private string _hostIp; // DU IP
        private string _tid;    // 메모
        private string _aid;
        private string _rxMin;
        private string _rxMax;
        private string _rxAvg;
        private string _txMin;
        private string _txMax;
        private string _txAvg;
        private string _time;
        private DateTime _dateTime;

        public int Number
        {
            get { return _number; }
            set { _number = value; OnPropertyChanged("Number"); }
        }

        public string Type
        {
            get { return _type; }
            set { _type = value; OnPropertyChanged("Type"); }
        }

        public string ProbeId
        {
            get { return _probeId; }
            set { _probeId = value; OnPropertyChanged("ProbeId"); }
        }

        public string Path
        {
            get { return _path; }
            set { _path = value; OnPropertyChanged("Path"); }
        }

        public string HostIP    // DU IP
        {
            get { return _hostIp; }
            set { _hostIp = value; OnPropertyChanged("HostIP"); }
        }

        public string TID   // 메모
        {
            get { return _tid; }
            set { _tid = value; OnPropertyChanged("TID"); }
        }

        public string AID
        {
            get { return _aid; }
            set { _aid = value; OnPropertyChanged("AID"); }
        }

        public string RxMin
        {
            get { return _rxMin; }
            set { _rxMin = value; OnPropertyChanged("RxMin"); }
        }

        public string RxMax
        {
            get { return _rxMax; }
            set { _rxMax = value; OnPropertyChanged("RxMax"); }
        }

        public string RxAvg
        {
            get { return _rxAvg; }
            set { _rxAvg = value; OnPropertyChanged("RxAvg"); }
        }

        public string TxMin
        {
            get { return _txMin; }
            set { _txMin = value; OnPropertyChanged("TxMin"); }
        }

        public string TxMax
        {
            get { return _txMax; }
            set { _txMax = value; OnPropertyChanged("TxMax"); }
        }

        public string TxAvg
        {
            get { return _txAvg; }
            set { _txAvg = value; OnPropertyChanged("TxAvg"); }
        }

        public string Time
        {
            get { return _time; }
            set { _time = value; OnPropertyChanged("Time"); }
        }

        public DateTime DateTime
        {
            get { return _dateTime; }
            set { _dateTime = value; OnPropertyChanged("DateTime"); }
        }

        public double? TxMinValue { get; set; }
        public double? TxMaxValue { get; set; }
        public double? TxAvgValue { get; set; }
        public double? RxMinValue { get; set; }
        public double? RxMaxValue { get; set; }
        public double? RxAvgValue { get; set; }
    }