within 5 minutes. However, the loop-top shows highest emission measure at 13:06:31 UT due to this hot temperature component. Intermediate temperature plasma component which was added to obtain the best fit did not provide any concluding information. In this method, as noted by @2013ApJ...778..139S, when the difference between two temperatures T$_1$-T$_2$ becomes similar to the sum of two half widths at half maximum i.e., 1.31($\sigma_1+\sigma_2$), isolation of two temperature components become difficult. In our case, it is difficult to isolate different temperature components for the foot-points A, B, and loop-top, beyond 13:10, 13:08, and 13:10 UT, respectively.

We also obtain the density at foot-point A using the differential emission measures (DEM) during the peak phase of the transient . We integrate the DEMs over the temperature range of 10-15 MK (see top panel of Figure \[fig:aia\_dem\]) and obtained emission measure (EM). We obtained the electron number density to be $9\times10^{10}$ cm$^{-3}$ at A by assuming a filling factor of unity and column depth of $2\arcsec$ (which is the extent of brightening).

![Same as Figure \[fig:temp\_A\] but for ARTB B.[]{data-label="fig:temp_B"}](fig11.eps){width="48.00000%"}

Spectroscopic Analysis {#sec:spectroscopy}
----------------------

Fortuitously, the spectroscopic slit during the sit-and-stare observation of IRIS was located right above the ARTB A 