diff --git a/monitoring/db/scripts/get_detailed_power.py b/monitoring/db/scripts/get_detailed_power.py
index 1d84672..28aaaf9 100755
--- a/monitoring/db/scripts/get_detailed_power.py
+++ b/monitoring/db/scripts/get_detailed_power.py
@@ -31,12 +31,11 @@ def parse_jobid(s):
 
 
 class Power:
-	def __init__(self, nodes, interval=-1):
+	def __init__(self, nodes):
 		self.nodes = nodes
 		self.epochs = OrderedDict()
 		self.first_ts = None
 		self.last_ts = None
-		self.interval = interval
 
 	@classmethod
 	def from_list(cls, data):
@@ -68,7 +67,6 @@ class Power:
 			raise RuntimeError
 
 		power = cls.from_list(all_list)
-		power.set_interval(interval*1000)    # milliseconds
 
 		return power 
  
@@ -89,9 +87,6 @@ class Power:
 
 		return fname
 	
-	def set_interval(self, interval):
-		self.interval = interval
-	
 	def insert_epoch(self, ts, values):
 		self.epochs[ts] = values
 		if not self.first_ts:
@@ -101,7 +96,7 @@ class Power:
 	def header(self):
 		hd  = "# all timestamp have unit miliseconds since unix epoch\n"
 		hd += "# all power values have unit Watt\n"
-		hd += "timestamp,delta_t,head_node_power,avg_node_power,median_node_power,min_node_power,max_node_power,std_dev_node_power"
+		hd += "timestamp,RESERVED,head_node_power,avg_node_power,median_node_power,min_node_power,max_node_power,std_dev_node_power"
 		# add node names here instead
 		hd += ",NO_NODE_NAMES_YET\n"
 		return hd
@@ -113,7 +108,7 @@ class Power:
 		return _body
 	
 	def summarize_time(self, ts):
-		return ts, self.interval
+		return ts, ""
 
 	@staticmethod
 	def summarize_values(val):