diff --git a/tantri/cli/__init__.py b/tantri/cli/__init__.py
index 210f7c6..d35c743 100755
--- a/tantri/cli/__init__.py
+++ b/tantri/cli/__init__.py
@@ -124,7 +124,7 @@ def write_time_series(dipoles_file, dots_file, measurement_type, delta_t, num_it
 	labels = [dot.label for dot in dots]
 	if header_row:
 		value_labels = ", ".join([f"{value_name}_{label}" for label in labels])
-		click.echo(f"t (s), {value_labels}")
+		output_file.write(f"t (s), {value_labels}\n")
 
 	_logger.debug(f"Going to simulate {num_iterations} iterations with a delta t of {delta_t}")
 
@@ -138,7 +138,7 @@ def write_time_series(dipoles_file, dots_file, measurement_type, delta_t, num_it
 	for i in tqdm.trange(num_iterations):
 		transition = time_series.transition()
 		transition_values = ", ".join(str(transition[label]) for label in labels)
-		output_file.write(f"{i * delta_t}, {transition_values}")
+		output_file.write(f"{i * delta_t}, {transition_values}\n")
 
 
 @cli.command()