diff --git a/nextflow.config b/nextflow.config
index 9a39932..7ce897c 100644
--- a/nextflow.config
+++ b/nextflow.config
@@ -33,8 +33,8 @@ params {
     // Plotting options
     plot_format                   = 'png'
     hic_tgt_resolution_plots      = 500000  // Approximate Hi-C data resolution used for plotting
-    plot_sig_interactions_cmap_lb = 1.0  // Lower bound for the color map used to plot significant iteractions
-    plot_sig_interactions_cmap_ub = 2.0  // Upper bound for the color map used to plot significant iteractions
+    plot_sig_interactions_cmap_lb = null    // Lower bound for the color map used to plot significant iteractions. Set to nchg_log_ratio when not specified
+    plot_sig_interactions_cmap_ub = 2.0     // Upper bound for the color map used to plot significant iteractions
     skip_expected_plots           = false
     skip_sign_interaction_plots   = false
 
diff --git a/subworkflows/nchg.nf b/subworkflows/nchg.nf
index bb7e92f..d3fc750 100644
--- a/subworkflows/nchg.nf
+++ b/subworkflows/nchg.nf
@@ -117,6 +117,10 @@ workflow NCHG {
                 .join(chrom_pairs.groupTuple())
                 .set { plotting_tasks }
 
+            if (!params.plot_sig_interactions_cmap_lb) {
+                plot_sig_interactions_cmap_lb = params.nchg_log_ratio
+            }
+
             PLOT_SIGNIFICANT(
                plotting_tasks,
                params.plot_sig_interactions_cmap_lb,