Chain Fission Yields: same parent different energy

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import pandas as pd
import plotly.express as px
import plotly.graph_objects as go

colors = {"Thermal":"orange", "Fast":"green","14 Mev":"red"}
ma = ["232th","233u","235u","238u","239pu","241pu"]
cols = [4,6,8]
title = ["Thermal","Fast","14 Mev"]

for nucid in ma:
    fig = go.Figure()
    i = 0
    for col in cols:
        df=pd.read_csv( nucid + "_chain.txt")
        df = df[pd.to_numeric(df[df.columns[col]],errors='coerce').notna()] # remove blanks (unknown intensities)
        df[df.columns[col]] = df[df.columns[col]].astype(float)                    
        fig.add_trace(go.Scatter( x=df[df.columns[3]], y=df[df.columns[col]], mode="lines+markers", name= title[i], marker_color=colors[title[i]]))
        i = i+1

    fig.update_layout(title= nucid + " Chain Fission Yields ", height=1000,xaxis_title="A", yaxis_title="Yield [%]") 
    fig.show()