diff --git a/y2023/constants/7971.json b/y2023/constants/7971.json
index 7cbb37e..a3bd130 100644
--- a/y2023/constants/7971.json
+++ b/y2023/constants/7971.json
@@ -13,6 +13,5 @@
       "calibration": {% include 'y2023/vision/calib_files/calibration_pi-7971-4_cam-23-04_ext_2023-02-19.json' %}
     }
   ],
-  "target_map": {% include 'y2023/vision/maps/target_map.json' %},
-  "scoring_map": {% include 'y2023/constants/scoring_map.json' %}
+  {% include 'y2023/constants/common.json' %}
 }
diff --git a/y2023/constants/971.json b/y2023/constants/971.json
index 7e979c7..16681fb 100644
--- a/y2023/constants/971.json
+++ b/y2023/constants/971.json
@@ -13,6 +13,19 @@
       "calibration": {% include 'y2023/vision/calib_files/calibration_pi-971-4_cam-23-08_ext_2023-02-22.json' %}
     }
   ],
-  "target_map": {% include 'y2023/vision/maps/target_map.json' %},
-  "scoring_map": {% include 'y2023/constants/scoring_map.json' %}
+  "robot": {
+    "tof": {
+      "interpolation_table": [
+        {
+          "tof_reading": 0.05,
+          "lateral_position": 0.23
+        },
+        {
+          "tof_reading": 0.90,
+          "lateral_position": -0.23
+        }
+      ]
+    }
+  },
+  {% include 'y2023/constants/common.json' %}
 }
diff --git a/y2023/constants/9971.json b/y2023/constants/9971.json
index 356b232..a4eaff4 100644
--- a/y2023/constants/9971.json
+++ b/y2023/constants/9971.json
@@ -13,6 +13,19 @@
       "calibration": {% include 'y2023/vision/calib_files/calibration_pi-9971-4_cam-23-12_ext_2023-03-05.json' %}
     }
   ],
-  "target_map": {% include 'y2023/vision/maps/target_map.json' %},
-  "scoring_map": {% include 'y2023/constants/scoring_map.json' %}
+  "robot": {
+    "tof": {
+      "interpolation_table": [
+        {
+          "tof_reading": 0.05,
+          "lateral_position": 0.23
+        },
+        {
+          "tof_reading": 0.90,
+          "lateral_position": -0.23
+        }
+      ]
+    }
+  },
+  {% include 'y2023/constants/common.json' %}
 }
diff --git a/y2023/constants/BUILD b/y2023/constants/BUILD
index 95d04a8..c91aa56 100644
--- a/y2023/constants/BUILD
+++ b/y2023/constants/BUILD
@@ -31,6 +31,7 @@
         "7971.json",
         "971.json",
         "9971.json",
+        "common.json",
         ":scoring_map",
         "//y2023/vision/calib_files",
         "//y2023/vision/maps",
diff --git a/y2023/constants/common.json b/y2023/constants/common.json
new file mode 100644
index 0000000..c559810
--- /dev/null
+++ b/y2023/constants/common.json
@@ -0,0 +1,2 @@
+  "target_map": {% include 'y2023/vision/maps/target_map.json' %},
+  "scoring_map": {% include 'y2023/constants/scoring_map.json' %}
diff --git a/y2023/constants/constants.fbs b/y2023/constants/constants.fbs
index e874275..bd038b8 100644
--- a/y2023/constants/constants.fbs
+++ b/y2023/constants/constants.fbs
@@ -8,10 +8,32 @@
   calibration:frc971.vision.calibration.CameraCalibration (id: 0);
 }
 
+// Data point for a single time of flight sensor reading. Used in a linear
+// interpolation table.
+table TimeOfFlightDatum {
+  // Time-of-flight sensor reading for the datum.
+  tof_reading:double (id: 0);
+  // Where the game piece is laterally in the robot frame. 0 = centered;
+  // positive = to the left of the robot.
+  // In meters.
+  lateral_position:double (id: 1);
+}
+
+table TimeOfFlight {
+  interpolation_table:[TimeOfFlightDatum] (id: 0);
+}
+
+table RobotConstants {
+  // Table of time-of-flight reading positions. Until we bother using one
+  // of our interpolation classes, should just contain two values.
+  tof:TimeOfFlight (id: 0);
+}
+
 table Constants {
   cameras:[CameraConfiguration] (id: 0);
   target_map:frc971.vision.TargetMap (id: 1);
   scoring_map:localizer.ScoringMap (id: 2);
+  robot:RobotConstants (id: 3);
 }
 
 root_type Constants;