Add down estimator plot

Change-Id: Id3fe6fef762cde1e77d09f779c451b3c2e3a471e
diff --git a/frc971/analysis/plot_index.ts b/frc971/analysis/plot_index.ts
index bfc8d53..1eba066 100644
--- a/frc971/analysis/plot_index.ts
+++ b/frc971/analysis/plot_index.ts
@@ -24,6 +24,7 @@
 import * as proxy from 'org_frc971/aos/network/www/proxy';
 import {plotImu} from 'org_frc971/frc971/wpilib/imu_plotter';
 import {plotDrivetrain} from 'org_frc971/frc971/control_loops/drivetrain/drivetrain_plotter';
+import {plotDownEstimator} from 'org_frc971/frc971/control_loops/drivetrain/down_estimator_plotter';
 import {plotRobotState} from
     'org_frc971/frc971/control_loops/drivetrain/robot_state_plotter'
 import {plotDemo} from 'org_frc971/aos/network/www/demo_plot';
@@ -83,6 +84,7 @@
   ['Demo', new PlotState(plotDiv, plotDemo)],
   ['IMU', new PlotState(plotDiv, plotImu)],
   ['Drivetrain', new PlotState(plotDiv, plotDrivetrain)],
+  ['Down Estimator', new PlotState(plotDiv, plotDownEstimator)],
   ['Robot State', new PlotState(plotDiv, plotRobotState)],
   ['C++ Plotter', new PlotState(plotDiv, plotData)],
 ]);