diff --git a/band-plan.html b/band-plan.html
index 7c9e358..e32267b 100644
--- a/band-plan.html
+++ b/band-plan.html
@@ -120,21 +120,28 @@ div>label {
 			return Number(number) >= Number(min) && Number(number) <= Number(max);
 		}
 
-		function add_power(ext, row) {
-			for (const [key, value] of Object.entries(ext.power)) {
-				row["power_" + key] = value;
-			}
+		function add_column(row, cols, header) {
+			header.columns.forEach((col) => {
+				if (header.columns.includes(col)) {
+					if (typeof cols[col] === 'object') {
+						for (const [key, value] of Object.entries(cols[col])) {
+							row[col + '_' + key] = value;
+						}
+					} else {
+						row[col] = cols[col];
+					}
+				}
+			});
 		}
 
 		function update_table(bases, extensions) {
 			let tdata = [];
-			let base_header = {};
-			let ext_header = {};
+			let header = {};
 
 			// first, fill base_header
 			bases.forEach((base) => {
 				if ((typeof base.header !== "undefined") && base.header) {
-					base_header = structuredClone(base);
+					header["base"] = structuredClone(base);
 				}
 			});
 
@@ -146,7 +153,7 @@ div>label {
 					// first, fill ext_header
 					extensions.forEach((ext) => {
 						if ((typeof ext.header !== "undefined") && ext.header) {
-							ext_header = structuredClone(ext);
+							header["extension"] = structuredClone(ext);
 						}
 					});
 
@@ -154,17 +161,13 @@ div>label {
 					let already_added = false;
 					extensions.forEach((ext) => {
 						if ((typeof ext.header === "undefined") || (ext.header == false)) {
-							base_header.columns.forEach((col) => {
-								if (base_header.columns.includes(col)) {
-									row[col] = base[col];
-								}
-							});
+							add_column(row, base, header["base"]);
 
 							let [ext_start, ext_end] = ext.frequency.split('-');
 							if (typeof base.frequency === "number") {
 								// at single frequency 
 								if (isInRange(base.frequency, ext_start, ext_end)) {
-									add_power(ext, row);
+									add_column(row, ext, header["extension"]);
 								} else {
 									return;
 								}
@@ -173,7 +176,7 @@ div>label {
 								let [base_start, base_end] = base.frequency.split('-');
 								if (isInRange(base_start, ext_start, ext_end) && isInRange(base_end, ext_start, ext_end)) {
 									// base range is inside of ext range or the same
-									add_power(ext, row);
+									add_column(row, ext, header["extension"]);
 								} else {
 									// base range is split by ext range
 									if (isInRange(ext_start, base_start, base_end)) {
@@ -182,7 +185,7 @@ div>label {
 										let start = ext_start;
 										let end = base_end < ext_end ? base_end : ext_end;
 										r["frequency"] = start + '-' + end;
-										add_power(ext, r);
+										add_column(r, ext, header["extension"]);
 										tdata.push(r);
 										already_added = true;
 									} else if (isInRange(ext_end, base_start, base_end)) {
@@ -191,7 +194,7 @@ div>label {
 										let start = base_start;
 										let end = ext_end;
 										r["frequency"] = start + '-' + end;
-										add_power(ext, r);
+										add_column(r, ext, header["extension"]);
 										tdata.push(r);
 										already_added = true;
 									}
@@ -232,11 +235,11 @@ div>label {
 
 						column.headerFilter = "input";
 						column.headerFilterFunc = filter_with_not;
-						if (typeof base_header.titles[column.field] !== "undefined") {
-							column.title = base_header.titles[column.field];
+						if (typeof header["base"].titles[column.field] !== "undefined") {
+							column.title = header["base"].titles[column.field];
 						}
-						if (typeof ext_header.titles[column.field] !== "undefined") {
-							column.title = ext_header.titles[column.field];
+						if (typeof header["extension"].titles[column.field] !== "undefined") {
+							column.title = header["extension"].titles[column.field];
 						}
 					});