diff --git a/qhtcp-workflow/apps/r/calculate_interaction_zscores.R b/qhtcp-workflow/apps/r/calculate_interaction_zscores.R
index 98345509..5a7a28af 100644
--- a/qhtcp-workflow/apps/r/calculate_interaction_zscores.R
+++ b/qhtcp-workflow/apps/r/calculate_interaction_zscores.R
@@ -776,19 +776,15 @@ generate_scatter_plot <- function(plot, config) {
     plot <- plot + geom_point(shape = 3, color = "gray70", size = 1)
   }
   
-  # Add Smooth Line if specified
-  if (!is.null(config$smooth) && config$smooth) {
-    smooth_color <- if (!is.null(config$smooth_color)) config$smooth_color else "blue"
-    
-    if (!is.null(config$lm_line)) {
-      plot <- plot +
-        geom_abline(
-          intercept = config$lm_line$intercept,
-          slope = config$lm_line$slope,
-          color = smooth_color,
-          linewidth = 1
-        )
-    }
+  # Add linear regression line if specified
+  if (!is.null(config$lm_line)) {
+    plot <- plot +
+      geom_abline(
+        intercept = config$lm_line$intercept,
+        slope = config$lm_line$slope,
+        color = ifelse(!is.null(config$lm_line$color), config$lm_line$color, "blue"),
+        linewidth = ifelse(!is.null(config$lm_line$linewidth), config$lm_line$linewidth, 1)
+      )
   }
   
   # Add SD Bands if specified
@@ -1072,11 +1068,11 @@ generate_interaction_plot_configs <- function(df_summary, df_interaction, type)
         x_labels = as.character(unique(group_data$conc_num)),
         ylim_vals = y_limits,
         y_filter = FALSE,
-        smooth = TRUE,
         lm_line = list(
           intercept = lm_intercept_value,
           slope = lm_slope_value,
-          color = "blue"
+          color = "blue",
+          linewidth = 1
         )
       )
       delta_plot_configs <- append(delta_plot_configs, list(plot_config))
@@ -1219,11 +1215,10 @@ generate_correlation_plot_configs <- function(df) {
             label = paste("R-squared =", round(r_squared, 3))
           )
         ),
-        smooth = TRUE,
-        smooth_color = "tomato3",
         lm_line = list(
           intercept = intercept,
-          slope = slope
+          slope = slope,
+          color = "tomato3"
         ),
         shape = 3,
         size = 0.5,