diff --git a/changes.patch b/changes.patch
new file mode 100644
index 0000000000..6c67f4f5f1
--- /dev/null
+++ b/changes.patch
@@ -0,0 +1,107 @@
+diff --git a/src/DataManipulator.ts b/src/DataManipulator.ts
+index 7f62295..e41b99c 100644
+--- a/src/DataManipulator.ts
++++ b/src/DataManipulator.ts
+@@ -1,20 +1,32 @@
+ import { ServerRespond } from './DataStreamer';
+ 
+ export interface Row {
+-  stock: string,
+-  top_ask_price: number,
+-  timestamp: Date,
++  price_abc: number,
++  price_def: number,
++  ratio: number,
++  timestamp: Date,  
++  upper_bound: number,
++  lower_bound: number,
++  trigger_alert: number | undefined,
+ }
+ 
+ 
+ export class DataManipulator {
+-  static generateRow(serverResponds: ServerRespond[]) {
+-    return serverResponds.map((el: any) => {
+-      return {
+-        stock: el.stock,
+-        top_ask_price: el.top_ask && el.top_ask.price || 0,
+-        timestamp: el.timestamp,
++  static generateRow(serverRespond: ServerRespond[]): Row {
++    const priceABC = (serverRespond[0].top_ask.price + serverRespond[0].top_bid.price) / 2;
++    const priceDEF = (serverRespond[1].top_ask.price + serverRespond[1].top_bid.price) / 2;
++    const ratio = priceABC / priceDEF;
++    const upperBound = 1 + 0.05;
++    const lowerBound = 1 - 0.05;
++    return {
++        price_abc: priceABC,
++        price_def: priceDEF,
++        ratio,
++        timestamp: serverRespond[0].timestamp > serverRespond[1].timestamp ?
++          serverRespond[0].timestamp : serverRespond[1].timestamp,  
++        upper_bound: upperBound,
++        lower_bound: lowerBound,
++        trigger_alert: (ratio > upperBound || ratio < lowerBound) ? ratio : undefined,
+       };
+-    })
+-  }
++    }
+ }
+diff --git a/src/Graph.tsx b/src/Graph.tsx
+index 277797d..c118b4f 100644
+--- a/src/Graph.tsx
++++ b/src/Graph.tsx
+@@ -1,5 +1,5 @@
+ import React, { Component } from 'react';
+-import { Table } from '@finos/perspective';
++import { Table, TableData } from '@finos/perspective';
+ import { ServerRespond } from './DataStreamer';
+ import { DataManipulator } from './DataManipulator';
+ import './Graph.css';
+@@ -23,10 +23,13 @@ class Graph extends Component<IProps, {}> {
+     const elem = document.getElementsByTagName('perspective-viewer')[0] as unknown as PerspectiveViewerElement;
+ 
+     const schema = {
+-      stock: 'string',
+-      top_ask_price: 'float',
+-      top_bid_price: 'float',
++      price_abc: 'float',
++      price_def: 'float',
++      ratio: 'float',
+       timestamp: 'date',
++      upper_bound: 'float',
++      lower_bound: 'float',
++      trigger_alert: 'float',
+     };
+ 
+     if (window.perspective && window.perspective.worker()) {
+@@ -38,21 +41,24 @@ class Graph extends Component<IProps, {}> {
+       elem.setAttribute('view', 'y_line');
+       elem.setAttribute('column-pivots', '["stock"]');
+       elem.setAttribute('row-pivots', '["timestamp"]');
+-      elem.setAttribute('columns', '["top_ask_price"]');
++      elem.setAttribute('columns', '["ratio", "lower_bound", "upper_bound", "trigger_alert"]');
+       elem.setAttribute('aggregates', JSON.stringify({
+-        stock: 'distinctcount',
+-        top_ask_price: 'avg',
+-        top_bid_price: 'avg',
++        price_abc: 'avg',
++        price_def: 'avg',
++        ratio: 'avg',
+         timestamp: 'distinct count',
++        upper_bound: 'avg',
++        lower_bound: 'avg',
++        trigger_alert: 'avg',
+       }));
+     }
+   }
+ 
+   componentDidUpdate() {
+     if (this.table) {
+-      this.table.update(
++      this.table.update([
+         DataManipulator.generateRow(this.props.data),
+-      );
++      ] as unknown as TableData);
+     }
+   }
+ }
diff --git a/src/DataManipulator.ts b/src/DataManipulator.ts
index 7f622955cc..e41b99c518 100644
--- a/src/DataManipulator.ts
+++ b/src/DataManipulator.ts
@@ -1,20 +1,32 @@
 import { ServerRespond } from './DataStreamer';
 
 export interface Row {
-  stock: string,
-  top_ask_price: number,
-  timestamp: Date,
+  price_abc: number,
+  price_def: number,
+  ratio: number,
+  timestamp: Date,  
+  upper_bound: number,
+  lower_bound: number,
+  trigger_alert: number | undefined,
 }
 
 
 export class DataManipulator {
-  static generateRow(serverResponds: ServerRespond[]) {
-    return serverResponds.map((el: any) => {
-      return {
-        stock: el.stock,
-        top_ask_price: el.top_ask && el.top_ask.price || 0,
-        timestamp: el.timestamp,
+  static generateRow(serverRespond: ServerRespond[]): Row {
+    const priceABC = (serverRespond[0].top_ask.price + serverRespond[0].top_bid.price) / 2;
+    const priceDEF = (serverRespond[1].top_ask.price + serverRespond[1].top_bid.price) / 2;
+    const ratio = priceABC / priceDEF;
+    const upperBound = 1 + 0.05;
+    const lowerBound = 1 - 0.05;
+    return {
+        price_abc: priceABC,
+        price_def: priceDEF,
+        ratio,
+        timestamp: serverRespond[0].timestamp > serverRespond[1].timestamp ?
+          serverRespond[0].timestamp : serverRespond[1].timestamp,  
+        upper_bound: upperBound,
+        lower_bound: lowerBound,
+        trigger_alert: (ratio > upperBound || ratio < lowerBound) ? ratio : undefined,
       };
-    })
-  }
+    }
 }
diff --git a/src/Graph.tsx b/src/Graph.tsx
index 277797d933..c118b4fc41 100644
--- a/src/Graph.tsx
+++ b/src/Graph.tsx
@@ -1,5 +1,5 @@
 import React, { Component } from 'react';
-import { Table } from '@finos/perspective';
+import { Table, TableData } from '@finos/perspective';
 import { ServerRespond } from './DataStreamer';
 import { DataManipulator } from './DataManipulator';
 import './Graph.css';
@@ -23,10 +23,13 @@ class Graph extends Component<IProps, {}> {
     const elem = document.getElementsByTagName('perspective-viewer')[0] as unknown as PerspectiveViewerElement;
 
     const schema = {
-      stock: 'string',
-      top_ask_price: 'float',
-      top_bid_price: 'float',
+      price_abc: 'float',
+      price_def: 'float',
+      ratio: 'float',
       timestamp: 'date',
+      upper_bound: 'float',
+      lower_bound: 'float',
+      trigger_alert: 'float',
     };
 
     if (window.perspective && window.perspective.worker()) {
@@ -38,21 +41,24 @@ class Graph extends Component<IProps, {}> {
       elem.setAttribute('view', 'y_line');
       elem.setAttribute('column-pivots', '["stock"]');
       elem.setAttribute('row-pivots', '["timestamp"]');
-      elem.setAttribute('columns', '["top_ask_price"]');
+      elem.setAttribute('columns', '["ratio", "lower_bound", "upper_bound", "trigger_alert"]');
       elem.setAttribute('aggregates', JSON.stringify({
-        stock: 'distinctcount',
-        top_ask_price: 'avg',
-        top_bid_price: 'avg',
+        price_abc: 'avg',
+        price_def: 'avg',
+        ratio: 'avg',
         timestamp: 'distinct count',
+        upper_bound: 'avg',
+        lower_bound: 'avg',
+        trigger_alert: 'avg',
       }));
     }
   }
 
   componentDidUpdate() {
     if (this.table) {
-      this.table.update(
+      this.table.update([
         DataManipulator.generateRow(this.props.data),
-      );
+      ] as unknown as TableData);
     }
   }
 }