diff --git a/data/refdata/exchanges.cfg b/data/refdata/exchanges.cfg
index 92f2761..93e944c 100644
--- a/data/refdata/exchanges.cfg
+++ b/data/refdata/exchanges.cfg
@@ -4,13 +4,12 @@
     "__DUMMY__": {}
     # ----------------------------- A
     , "TRADING_SIMULATOR": {
-        "__dummy__": null
         # "exchange_id":          "COINBASE"
         # , "name":               "Coinbase AT (Simulated)"
         # , "type":               "SPOT"
         # , "quote_asset":        "USD"
 
-        , "mktdata" : {
+        "mktdata" : {
             "class":  "cvttpy_trading.exchanges.coinbase.spot.mkt_data.CoinbaseSpotMdFeed"
 
             , "reconnect_secs": 2
@@ -22,8 +21,8 @@
                     "url": "wss://ws-feed.exchange.coinbase.com"
                 }
             }
-        }
-        , "order_entry": {
+        },
+        "order_entry": {
             "class":  "cvttpy_trading.exchanges.coinbase.spot.oe_client.CoinbaseSpotOEClient"
 
             , "api": {
@@ -36,9 +35,9 @@
                     , "cancel_order_url": ["POST", "https://api.coinbase.com/api/v3/brokerage/orders/batch_cancel"]
                 }
             }
-        }
+        },
 
-        , "accounting": {
+        "accounting": {
             "class":  "cvttpy_trading.exchanges.coinbase.spot.account.CoinbaseSpotAccounting"
 
             , "api": {