diff --git a/projectnetwork.go b/projectnetwork.go
index eb1fbd1..4d52279 100644
--- a/projectnetwork.go
+++ b/projectnetwork.go
@@ -90,14 +90,14 @@ type activity struct {
 	earlyFinish float64
 	lateStart   float64
 	lateFinish  float64
-	slack	float64
+	slack       float64
 }
 
 func (a *activity) Attributes() []encoding.Attribute {
 	return []encoding.Attribute{
 		{"DUR", strconv.FormatFloat(a.duration, 'g', -1, 64)},
 		{"ES", strconv.FormatFloat(a.earlyStart, 'g', -1, 64)},
-		{"EF", strconv.FormatFloat(a.earlyStart, 'g', -1, 64)},
+		{"EF", strconv.FormatFloat(a.earlyFinish, 'g', -1, 64)},
 		{"LS", strconv.FormatFloat(a.lateStart, 'g', -1, 64)},
 		{"LF", strconv.FormatFloat(a.lateFinish, 'g', -1, 64)},
 		{"SLACK", strconv.FormatFloat(a.slack, 'g', -1, 64)},