LPC is correct. However there are no significant errors in RTOW charts but a situation where it is possible to get V1 lower than that is shown at the bottom of the chart as minimum V1.
According to Airbus
- The Minimum V1 at the bottom of the chart is calculated by adding
The maximum VMCG on complete chart
+
The maximum (V1-VEF) (complete chart)
- For a given point, V1 can be less than this minimum value if (VEF=VMCG) and (V1-VEF) is less than (MAX V1-VEF)