Scatter of RV measurements for GJ 588 (14 June 2021, top) and GJ 784 (17 August 2021, bottom). Left: time series performed over a time range of around 3.7 hours. Right: relations between the RV and various weather parameter together with the corresponding Pearson correlation coefficient, ρ. Even with changing weather parameters, an RV precision of 2.18 m/s for GJ 588 and 3.06 m/s for GJ 784 is reached.