diff --git a/api/src/schema.gql b/api/src/schema.gql
index 41bcc26a44002b9a834896cb435e7d1eeeeba58e..b2c3ddb14a0cd1ade6d856616c0f56634915c969 100644
--- a/api/src/schema.gql
+++ b/api/src/schema.gql
@@ -93,8 +93,8 @@ type HeatMapResult {
 
 type LineChartResult {
   name: String!
-  xAxis: ChartAxis!
-  yAxis: ChartAxis!
+  xAxis: ChartAxis
+  yAxis: ChartAxis
   lines: [LineResult!]!
 }
 
@@ -110,7 +110,7 @@ type ExtraLineInfo {
 
 type LineResult {
   label: String!
-  x: Float!
+  x: [Float!]!
   y: [Float!]!
   extraLineInfos: [ExtraLineInfo!]
   type: LineType